114. Sex Reversal in the Japanese W rasse, By Yo K. OKADA, M.J.A. (Comm. Oct. 12, 1962)
|
|
- Silvia Doyle
- 5 years ago
- Views:
Transcription
1 e 508 [Vol. 38, 114. Sex Reversal in the Japanese W rasse, Halichoeres poecilopterus By Yo K. OKADA, M.J.A. (Comm. Oct. 12, 1962) The Labridae are a group of fish mostly assuming beautiful colouration or colour patterns which vary considerably not only among different species but according to the sex in the same species. Not infrequently, the sexual difference is so marked that the two sexes of the same fish are regarded as different species. Halichoeres poecilopterus is one of such examples. The green coloured Aobera and the red coloured Akabera were once regarded as different species, the former being referred to Julis poecilopterus and the latter Julis pyrrhogramma, but it is now well established that the two are only sexual colour varieties of the same fish, Halichoeres poecilopterus. The so-called Aobera or blue wrasse is comparatively large. Those found in Tokyo Bay usually measure 160 to 215 mm in body length, smaller ones being rarely encountered. The body is coloured dark green on the back and paler below with a large blackish brown spot behind the pectoral fin. Moreover, there is a dark brown longitudinal band on both sides of the body, accompanied by two or three rows of brownish spots above and three or four rows of yellowish spots below. The width of the band increases with the length of the body. However, the band becomes lighter in colour as the fish increases in length, so that the band of larger fishes is less distinct than that of smaller ones. Furthermore, in smaller and accordingly younger fishes, a similar dark brown band is also found on the head, but in larger fishes the band is replaced by elongated spots and longitudinal light blue bars with dark brown margin, one extending between the tip of the snout and the eye, others distributing on the cheek and the side of the head. Another characteristic of the Aobera is that the caudal fin exhibits five or six wavy stripes of reddish brown colour. The red wrasse or Akabera, on the other hand, is tinted red all over the body as the name indicates. It differs from Aobera not only in colour and colour patterns, but also in size. They seldom exceed 150 mm, and lack the black spots on the breast which are characteristic of the blue wrasse. A longitudinal band running along the side of the body as that seen in the blue wrasse is narrow but dark in colour and distinct, the tone being the same throughout the whole length to the tip of the snout. Three rows of brownish spots
2 No. 8] Sex Reversal in the Japanese Wrasse, Halichoeres poecilopterus 509 above the band and the four rows of yellowish spots below are also distinct but the reddish wavy stripes on the caudal fin are less developed as compared with those of the blue wrasse. Bluish horizontal lines and spots under the eyes are indistinct in their outline. As early as 1902, Jordan and Snyder pointed out that the characteristics of these two kinds of Japanese wrasse are merely the differences between the two sexes of the same species. Kinoshita verified this view by his experiments carried out in He observed that the blue wrasses rapidly lose their sexual characteristics after castration, while the red wrasses are not affected by extirpation of the sexual glands at any developmental stage. However, if a testis is transplanted to the red wrasses, they transform after several months into blue wrasses (1938). Transplantation of an ovary to the blue wrasses causes no changes in colouration in the recepients (1939). It is evident from these experiments that the blue and red wrasses are males and females of the same species, respectively. However, there are some problems to be solved. Are both sexes separate from the time of hatching, colour and colour patterns peculiar to the male sex becoming developed at a certain stage of growth? So far as my observation is concerned, the so-called Akabera (red wrasse) from different parts of Japan have always been females with the ovary, no matter whether they are mature or immature. The question arises, therefore, as to whether the species passes the young stage as the female and later reverses into the male. There is an interesting passage in the article by Kinoshita in "Shokubutsu oyobi Dobutsu" (Botany and Zoology) Vol. IV, No. 6, He states, "The external appearance of a wrasse, 156 mm in length, taken out from an aquarium in the state of hibernation showed characteristics intermediate between the male and female. The sexual gland of the fish was apparently a normal testis to the naked eye, but when studied in sections, there were innumerable egg-like cells distributed over the whole tissue" (l.c., fig. 4). According to Kinoshita, this specimen failed to display the male sex characters and he attributed the failure to the antagonizing effect exerted by the egg-like cells on the action of the testicular hormone. In the same article, Kinoshita further states that he observed a structural change in the sexual gland of a young fish which suggests a transformation of the female elements into the male. These observations and discussions are, of course, far from satisfactory, since they were based upon only one specimen out of twentyseven, and the mentioned egg-like cells were regarded as the testis-ova.
3 510 YO K. OKADA [Vol. 38, I carried out experiments in this wrasse on the formation of spermatozoaa in the female gonad following administration of androgenic hormone. I inserted a small amount of crystalline methyltestosterone under the scales of some twenty red wrasses of various developmental stages, ranging from young fishes measuring about 100 mm to mature ones about 140 mm in length. The experiments were not successful in inducing sperm formation, but caused a change in the secondary sex characters in all the fish; the red wrasses invariably transformed into the blue wrasses. Fig. 1 shows three representatives; a Fig. 1. Three representatives of changed colour patterns in red morasses of different developmental stage after insertion of crystalline methyltestosterone under scales. All in same proportion. young (upper), an adult (lower), and a mediumsized specimen (middle). The photographs were taken one month after the treatment which was carried out on October 3, In each case the dark brownish spot characteristic of the blue wrasse is distinctly observed just behind the pectoral fin. The stripes on the head and the wavy lines on the caudal fin are also clearly seen, but the longitudinal band on the body side is still narrow and dark in colour, and extends anteriorly to the tip of the snout. Another characteristic worthy of note was that mature specimens reacted faster than younger ones in the course of the experiment. Recently I obtained the following results after making an examination of the relationship between the length of the body (degree of growth) and the sex ratio in materials from both the Seto Inland Sea and Tokyo Bay. The body lengths of 26 specimens from the Seto Inland Sea varied from 111 to 167 mm and those measuring over 140 mm were males or regarded as males. Therefore, the sex ratio was 16 ~ :10g. The fishes from Tokyo Bay were generally larger than those from the Seto Inland Sea, ranging from 112 to 215 mm in length. Among them, those measuring from 140 to 150 mm were females, smaller ones being young fish, and those above
4 No. 8] Sex Reversal in the Japanese Wrasse, Halichoeres poecilopterus mm males. Among those measuring from 160 to 170 mm there were a considerable number of fishes which were apparently sexually intermediate. Thus the sex ratio of those from Tokyo Bay, except for 7 young fishes, was 17 : 9 : 24g. Fig. 2 shows two cases of the intermediate type. In the case a (upper in the figure) the scales forming the black spot on the breast are slightly developed, and the irregular stripes on the head have become faintly visible. In the case b (lower) the dark brownish longitudinal band extending caudally from the pectoral fin is of a considerable width, and the irregular stripes on the cheek are also conspicuous, Fig. 2. colour Two patterns examples between of fish red having and blue intermediate wrasseṣ but the dark brownish band still remains along the head. The black spots on the breast are not yet fully developed. The process of natural transformation from the red wrasses into the blue wrasses as represented by these two specimens seems to be slightly different from that caused by insertion of crystalline methyltestosterone. In the former case it seems likely that the longitudinal band on the body side becomes wider and paler in colour prior to the formation of the black spot on the breast. The gonad of these intermediate fishes was next examined in sections. The results are shown for the briefness'sake by accompanying figures. The first and the last figures of the plate are a mature ovary and a testis filled with spermatozoa, respectively, which are presented here for comparison. The wrasses lay eggs in June or July in southern Japan, and from August to October in Tokyo Bay. After that, the ovary diminishes in size to one-third of the original. The second figure of the plate shows an ovary just after spawning, each of the ovarian lobes being filled with young o cytes. In this state the wrasse is supposed to enter the hibernation. One may conjecture that the egg cells remain undeveloped until the next spring. However, as the third figure of the plate indicates, an infiltration of a considerable amount of white blood corpuscles (phagocytes) into the connective tissue has occurred in each of the ovarian lobes at a little later stage where the ovary has undergone regres-
5 512 YO K. OKADA [Vol. 38, Explanation of Plate 1. Matured ovary with fully grown egg cells. 2. Spent ovary immediate after ovulation. 3. Ovarian lobes at the beginning of transformation of sexual elements. 4. The same in advanced stage. 5. Ovary transformed into testis, no longer showing remains of female elements. 6. Testis filled with spermatozoa. Magnification: 3 and 4 x 120, others x 30. Abbreviation : By, blood vessel; Oc, oocyt; Oc', degenerated oocyt; Ov, ovum; Ph, phagocyte; Sc, spermatocyt; St, spermatid; Sz, spermatozoa; Vd, vas deferens.
6 No. 8] Sex Reversal in the Japanese wrasse, Halichoeres poecilopterus 513 sive changes to a considerable degree. In addition to degenerating egg cells, sperm cells are found in the same genital epithelium especially near the free end of the ovarian lobes. The fourth figure of the plate depicts the state in which the sex gland has been further transformed. At this stage the sex gland is no longer an ovary, hardly and oocytes being found in each lobe. Most of the egg cells have been replaced by masses of sperm cells. The fifth figure represents a further advanced stage. The gonad is now completely transformed into a testis. It is likely that the wrasse hibernates in this state and functions as a male in the next reproductive season. The above is the description of the sex reversal in Halichoeres poecilopterus based upon observations of external transformation of sex characters and internal changes of the gonad. In summary, it may be that the Japanese wrasse, after reaching maturity, first functions as a female, and then transforms into a male following drastic changes in the gonad, the remaining egg cells undergoing degeneration and spermatozoa being formed from reserved primitive germ cells. Consequently the ovary is transformed into a testis, and the fish now comes to function as male. Thus, the appearance of sperm cells in the ovary of incompletely developed blue wrasses is not an abnormal phenomenon. It is merely a case of protogynous transitional hermaphroditism. It is said that the red wrasse readily goes into hibernation if the temperature is lowered in the aquarium, but the blue wrasse hardly does so and most of them cannot stand the low temperature. According to a recent information from Prof. S. Kawaguti of the Okayama University most of the red wrasses which had been kept in the Tama Aquarium since last autumn, 30 out of 40 fishes turned into the blue wrasses in the course of 40 days from June 15 to July 23. All these facts indicate that the wrasse is hatched out as a female and dies as a male, and the sex reversal is an ordinary phenomenon taking place during its life cycle. I should like to close the present report by expressing my hearty thanks to Mr. S. Yagi of the Matsuyama Museum and to Dr. Y. Haneda, Director of the Kurihama Natural History Museum, for their kind supply of the material of respective district. References Jordan, D. S. and Snyder, J. 0. (1902): Proc. U.S. Nat Mus., 24, Kinoshita, Y. (1934) : Jour. Sci. Hiroshima Univ., B, Div. 1, 3. (1935a) : Bot. Zool., 3(7), 35-. (1935b) Jour. Sci. Hiroshima Univ., B. Div. 1, 4, (1936) : Bot & Zool., 4(6), 35-. (1938) : Zool Mag. (Japan), 50(4), (1939) : Ditto, 51(2), 131. &
SEX BEHAVIOUR AND SEX DETERMINATION IN CREPIDVLA FORNICATA L.
[34] SEX BEHAVIOUR AND SEX DETERMINATION IN CREPIDVLA FORNICATA L. BY JAN Z. WILCZYNSKI Lebanese State University, Beirut, Lebanon (Received 21 November 1957) INTRODUCTION The problem of sex determination
More informationProtogynous Hermaphroditism in the Sand Diver Trichonotus filamentosus
Œ Ÿ ª ŽYŽŽŒ± ê j. Nippon Suisan Gakkaishi 57(1), 35-40 (1991) Protogynous Hermaphroditism in the Sand Diver Trichonotus filamentosus Janny Dirk Kusen,*1 Kiyoshi Nakagawa,2 Yutaka Yogo,*3 and Akinobu Nakazono*1
More informationCHARA CTERS* nearly sterile. As in other similar combinations the sex glands are reduced ZOOLOGY: E. WITSCHI
ZOOLOGY: E. WITSCHI VOL. 23, 1937 35 STIMULATIVE AND INHIBITIVE INDUCTION IN THE DEVELOPMENT OF PRIMARY AND SECONDARY SEX CHARA CTERS* By EMIL WITSCHI DEPARTMENT OF ZOOLOGY, STATE UNIVERSITY OF IOWA Read
More informationTHE EFFECTS OF REPEATED INJECTIONS OF CHORIONIC GONADOTROPIN ON THE TESTES OF THE LEOPARD FROG (RANA PIPIENS SCHREBER)
THE EFFECTS OF REPEATED INJECTIONS OF CHORIONIC GONADOTROPIN ON THE TESTES OF THE LEOPARD FROG (RANA PIPIENS SCHREBER) ROBERT P. McCOURT Department of Zoology and Entomology, The Ohio State University,
More informationKazunori Fujii. National Research Institute of Fisheries and Environment of Inland Sea, Fisheries Research Agency
The Effects of Endocrine Disruptors on Fish Maturation and Reproduction - A Focus on Projects Underway at the Ministry of Agriculture, Forestry, and Fisheries - Kazunori Fujii National Research Institute
More informationTo General Embryology Dr: Azza Zaki
Introduction To General Embryology The Human Development is a continuous process that begins when an ovum from a female is fertilized by a sperm from a male. Cell division, growth and differentiation transform
More informationIntroduction to Health Care & Careers. Chapter 30. Answers to Checkpoint and Review Questions
Introduction to Health Care & Careers Chapter 30 Answers to Checkpoint and Review Questions Checkpoints 1. What are the three functions of testosterone? The three functions of testosterone are to develop
More informationMeiosis & Sexual Reproduction. AP Biology
Meiosis & Sexual Reproduction 2007-2008 Cell division / Asexual reproduction Mitosis produce cells with same information identical daughter cells exact copies clones same amount of DNA same number of chromosomes
More informationDevelopment of the Genital System
Development of the Genital System Professor Alfred Cuschieri Department of Anatomy University of Malta The mesonephros develops primitive nephrotomes draining into a mesonephric duct nephrotome mesonephric
More informationEffect of Gonadotropic Hormones on Hypophysectomized (Anterior Lobe) Male Rana Pipiens
The Ohio State University Knowledge Bank kb.osu.edu Ohio Journal of Science (Ohio Academy of Science) Ohio Journal of Science: Volume 54, Issue 3 (May, 1954) 19545 Effect of Gonadotropic Hormones on Hypophysectomized
More informationREPRODUCCIÓN. La idea fija. Copyright 2004 Pearson Education, Inc., publishing as Benjamin Cummings
REPRODUCCIÓN La idea fija How male and female reproductive systems differentiate The reproductive organs and how they work How gametes are produced and fertilized Pregnancy, stages of development, birth
More informationA Case of Hermaphroditism and Viviparity in Echinocardiumcordatum.
[ 103 ] A Case of Hermaphroditism and Viviparity in Echinocardiumcordatum. "By Hilary B. Moore, Ph.D., Marine Biological Laboratory, Plymouth. With 4 Figures in the Text. IN May, 1933, during routine gonad
More informationMale Reproduction Organs. 1. Testes 2. Epididymis 3. Vas deferens 4. Urethra 5. Penis 6. Prostate 7. Seminal vesicles 8. Bulbourethral glands
Outline Terminology Human Reproduction Biol 105 Lecture Packet 21 Chapter 17 I. Male Reproduction A. Reproductive organs B. Sperm development II. Female Reproduction A. Reproductive organs B. Egg development
More informationMale Reproductive System
Male Reproductive System The male reproductive system consists of a number of sex organs that are part of the reproductive process. The following sections describe the function of each part of the male
More information9.4 Regulating the Reproductive System
9.4 Regulating the Reproductive System The Reproductive System to unite a single reproductive cell from a female with a single reproductive cell from a male Both male and female reproductive systems include
More informationA revision of the genus Acaníhocordax Günther, 1929 (Dermaptera, Forficulidae)
ANNALES HISTORICO-NATURALES MUSEI NATIONALIS HUNGARICI Tomus 80. Budapest, 1988 p. 51-56. A revision of the genus Acaníhocordax Günther, 1929 (Dermaptera, Forficulidae) by H. STEINMANN, Budapest H. STEINMANN:
More informationEmbryology 3. Spermatogenesis:
Embryology 3 Spermatogenesis: The 2 testis in males are each divided into lobes and lobules by connective tissue septa forming 250 lobule and in each lobule there are 1 to 4 seminefrous tubule ( so almost
More informationLIFE SCIENCES Grade 12 REPRODUCTION 30 JUNE 2014
REPRODUCTION 30 JUNE 2014 Checklist Make sure you Can describe different reproductive strategies of vertebrates Are able to identify the structure and function of the male and female reproductive organs
More informationPhysiology of Male Reproductive System
Physiology of Male Reproductive System the anterior pituitary gland serves as the primary control of reproductive function at puberty Ant Pituitary secretes FSH & large amounts of LH (ICSH) FSH & LH cause
More informationFemale and Male Reproductive Systems
Female and Male Reproductive Systems Reproductive System: Organs that make possible the production of offspring. Female Reproductive System Female Reproductive System: Words to be familiar with ESTROGEN
More informationChapter 46 ~ Animal Reproduction
Chapter 46 ~ Animal Reproduction Overview Asexual (one parent) fission (parent separation) budding (corals) fragmentation & regeneration (inverts) parthenogenesis Sexual (fusion of haploid gametes) gametes
More informationSISTEMA REPRODUCTOR (LA IDEA FIJA) Copyright 2004 Pearson Education, Inc., publishing as Benjamin Cummings
SISTEMA REPRODUCTOR (LA IDEA FIJA) How male and female reproductive systems differentiate The reproductive organs and how they work How gametes are produced and fertilized Pregnancy, stages of development,
More informationReproductive Endocrinology. Isabel Hwang Department of Physiology Faculty of Medicine University of Hong Kong Hong Kong May2007
Reproductive Endocrinology Isabel Hwang Department of Physiology Faculty of Medicine University of Hong Kong Hong Kong May2007 isabelss@hkucc.hku.hk A 3-hormone chain of command controls reproduction with
More informationReproductive System Purpose General Structures Male Structures Functions Female Anatomy Structures Functions Clinical Applications
The Reproductive System: Male, Ch 23 Outline of class lecture After studying the male reproductive system you should be able to: 1. Define the purpose of reproduction and identify the general organs of
More informationTestes (male gonads) -Produce sperm -Produce sex hormones -Found in a sac called the scrotum -Suspended outside of the body cavity for temperature
REPRODUCTION Testes (male gonads) -Produce sperm -Produce sex hormones -Found in a sac called the scrotum -Suspended outside of the body cavity for temperature reduction -Testes wall made of fibrous connective
More informationTopic 18- Human Reproductive System. Day 2-Female (and review of) Male Reproductive Systems
Topic 18- Human Reproductive System Day 2-Female (and review of) Male Reproductive Systems Bell Ringer (5 minutes) Bioblitz WHAT ARE WE LEARNING TODAY? Date: 12/14-12/15 Topic: Human Reproductive System
More informationIn domestic animals, we have limited period of estrus (sexual receptivity) and the term estrous
REPRODUCTIVE CYCLES 1. Estrous cycle 2. Menstrual cycle In domestic animals, we have limited period of estrus (sexual receptivity) and the term estrous cycle is used. The onset of proestrus defines the
More informationTHE EFFECTS ON THE FAT AND STARCH METABOLISM OF GEBIA BY THE PARASITE GYGE BRANCHIALIS
THE EFFECTS ON THE FAT AND STARCH METABOLISM OF GEBIA BY THE PARASITE GYGE BRANCHIALIS BY T. E. HUGHES, M.A. (Received 3 May 1940) INTRODUCTORY AN account of the effects of Gyge branchialis on its Decapod
More informationReproductive system Presented by: Ms. Priya
Reproductive system Presented by: Ms. Priya Reproductive system Female reproductive system has two functions: produce egg cells to protect and nourish the offspring (baby) until birth. Male reproductive
More informationTHE INFLUENCE OF LIGHT AND TEMPERATURE ON BODY FAT AND REPRODUCTIVE CONDITIONS OF RAN A PIPIENS 12
THE INFLUENCE OF LIGHT AND TEMPERATURE ON BODY FAT AND REPRODUCTIVE CONDITIONS OF RAN A PIPIENS 12 FRED J. BRENNER AND PATRICIA E. BRENNER Biology Department, Thiel College, Greenville, Pennsylvania ABSTRACT
More informationMULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question.
MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 1) Which of the following hormones controls the release of anterior pituitary gonadotropins? A) LH
More information4.05 Remember the structures of the reproductive system
4.05 Remember the structures of the reproductive system Scrub In The external area between the vulva and the anus is the : a. Cervix b. Endometrium c. Perineum d. Vagina What structure connects the testes
More informationENV/JM/MONO(2015)37/PART2
Unclassified ENV/JM/MONO(2015)37/PART2 ENV/JM/MONO(2015)37/PART2 Unclassified Organisation de Coopération et de Développement Économiques Organisation for Economic Co-operation and Development 20-Nov-2015
More informationANATOMY AND PHYSIOLOGY HOMEWORK CHAPTER 15 AND 16
ANATOMY AND PHYSIOLOGY HOMEWORK CHAPTER 15 AND 16 Name Identify the following: 1) The ureter is indicated by letter 2) The renal pyramid is indicated by letter 3) The fibrous capsule is indicated by letter
More informationThe Reproductive System
Essentials of Human Anatomy & Physiology Elaine N. Marieb Seventh Edition Chapter 16 The Reproductive System Slides 16.1 16.20 Lecture Slides in PowerPoint by Jerry L. Cook The Reproductive System Gonads
More information18 Urinary system. 19 Male reproductive system. Female reproductive system. Blok 11: Genital and Urinary Tract Diseases
Blok 11: Genital and Urinary Tract Diseases 18 Urinary System 19 Male Genital System 20 Female Genital System 18 Urinary system You should be able to: 1. Describe the structures and associated functions
More informationThe Reproductive System
16 PART A The Reproductive System PowerPoint Lecture Slide Presentation by Jerry L. Cook, Sam Houston University ESSENTIALS OF HUMAN ANATOMY & PHYSIOLOGY EIGHTH EDITION ELAINE N. MARIEB The Reproductive
More informationWhy Reproduce? In order to ensure the continuation of the species and the continuation of life in general by producing offspring
Quiz: Evolution Human Reproduction Why Reproduce? In order to ensure the continuation of the species and the continuation of life in general by producing offspring Asexual vs Sexual Reproduction Remember:
More informationOvary. Ovary is the female gonad or sex gland. Gonad: an organ that produces gametes; a testis or ovary.
Ovary The ovary is composed of two parts: Outer cortex : houses the follicels. Inner medulla: is the middle region composed of connective tissue, blood vessels and lymphatics. Ovary is the female gonad
More informationApendiks / Appendix. Manual to determine gonadal maturity of North Atlantic cod (Gadus morhua) inshore in West Greenland. Macroscopic and histological
pendiks / ppendix Manual to determine gonadal maturity of North tlantic cod (Gadus morhua) inshore in West Greenland. Macroscopic and histological I II Manual to determine gonadal maturity of North tlantic
More informationGerm Cell Transplantation in Fish
Larvi 2009 Germ Cell Transplantation in Fish Goro Yoshizaki (Tokyo University of Marine Science and Technology, SORST/JST) Tuna Mackerel Body weight; 300 kg 300 g Body length; 3 m 30 cm Scombridae family
More informationNeurons and Hormones 3
Neurons and Hormones 3 Neural Command Centers Behavioral Schedules Daily rhythms: internal and external factors Long-term rhythms: internal and external factors Priorities & the Social Environment Hormones
More information4.05 Remember the structures of the reproductive system
4.05 Remember the structures of the reproductive system 4.05 Remember the structures of the reproductive system Essential question What are the structures of the reproductive system? 2 Structures of the
More informationChapter 36 Active Reading Guide Reproduction and Development
Name: AP Biology Mr. Croft Chapter 36 Active Reading Guide Reproduction and Development Section 1 1. Distinguish between sexual reproduction and asexual reproduction. 2. Which form of reproduction: a.
More informationOutline. Male Reproductive System Testes and Sperm Hormonal Regulation
Outline Male Reproductive System Testes and Sperm Hormonal Regulation Female Reproductive System Genital Tract Hormonal Levels Uterine Cycle Fertilization and Pregnancy Control of Reproduction Infertility
More informationto ensure the. Sexual reproduction requires the (from the mother) by a (from the father). Fertilization is the fusion of.
The Reproductive System Fill-In Notes Purpose of life: to ensure the. Stages of Human Development Sexual reproduction requires the (from the mother) by a (from the father). Fertilization is the fusion
More informationChapter 22 The Reproductive System (I)
Chapter 22 The Reproductive System (I) An Overview of Reproductive Physiology o The Male Reproductive System o The Female Reproductive System 22.1 Reproductive System Overview Reproductive system = all
More information[485] THE BREAKDOWN OF THE THORACIC GLAND IN THE ADULT INSECT, RHODNIUS PROLIXUS
[485] THE BREAKDOWN OF THE THORACIC GLAND IN THE ADULT INSECT, RHODNIUS PROLIXUS BY V. B. WIGGLESWORTH Department of Zoology, University of Cambridge (Received 3 November 1954) The thoracic or ' prothoracic'
More informationMale Reproductive System
Male Reproductive System Constitution of male reproductive system Genital gland ----testis Genital ducts epididymis / ductus deferens / urinary duct Accessory sex glands Penis prostate gland Seminal vesicle
More informationChapter 16 Endocrine and Reproductive Health
Note Taking Lesson 2 The Male Reproductive System Directions: Use the following outline to help organize your notes as you read through the lesson. Key Concept Consider and Reconsider Before reading the
More informationAP Biology Ch ANIMAL REPRODUCTION. Using only what you already know (you cannot look up anything) complete the chart below.
AP Biology Ch. 46 - ANIMAL REPRODUCTION Using only what you already know (you cannot look up anything) complete the chart below. I. Overview of Animal Reproduction A. Both asexual and sexual reproduction
More informationTestosterone Therapy-Male Infertility
Testosterone Therapy-Male Infertility Testosterone Therapy-Male Infertility Many men are prescribed testosterone for a variety of reasons. Low testosterone levels (Low T) with no symptoms, general symptoms
More informationMale Anatomy. testes, genetically determined in mammals - testis releases hormones that then control the development of secondary sex characteristics
Male Anatomy Male Anatomy Primary Organ testes, genetically determined in mammals - testis releases hormones that then control the development of secondary sex characteristics 1) Secondary Organs internal
More informationDiagram Of A Rabbit Reproductive System
Diagram Of A Rabbit Free PDF ebook Download: Diagram Of A Rabbit Download or Read Online ebook diagram of a rabbit reproductive system in PDF Format From The Best User Guide Database Name the accessory
More informationFEMALE REPRODUCTIVE SYSTEM
FEMALE REPRODUCTIVE SYSTEM UTERUS (made up of muscular walls, a lining called the endometrium, and a cervix. The uterus is also called womb ) houses and protects embryo/fetus/baby allows nutrient & waste
More informationBy J. W. SLUITER, G. J. VAN OORDT, AND J. C. A. MIGHORST. {From the Department of Endocrinology, Zoological Laboratory, University of Utrecht)
13* A Study of the Testis Tubules, Interstitial Tissue, and Sex Characters (Thumb-pads and Wolffian Ducts) of Normal and Hypophysectomized Frogs (Rana esculenta) By J. W. SLUITER, G. J. VAN OORDT, AND
More informationMULTIPLE CHOICE: match the term(s) or description with the appropriate letter of the structure.
Chapter 27 Exam Due NLT Thursday, July 31, 2015 Name MULTIPLE CHOICE: match the term(s) or description with the appropriate letter of the structure. Figure 27.1 Using Figure 27.1, match the following:
More information1. Be able to characterize the menstrual cycle from the perspective of the ovary a. Follicular phase b. Luteal phase
Human Sexuality Exam II Review Material Gametogenesis: Oogenesis 1. Be able to characterize the menstrual cycle from the perspective of the ovary a. Follicular phase b. Luteal phase 2. Know the relative
More informationCell Divisions. The autosomes represent the whole body. * Male Sex Chromosomes: XY * Female Sex Chromosomes: XX
Cell Divisions Each Cell (including gonads) has 46 chromosomes (23 pairs of chromosomes: 22 pairs of autosomes, 1 pair of sex chromosomes) which are located in the nucleus). The autosomes represent the
More informationFIGURE 54 represents the urogenital apparatus
CHAPTER VI THE UROGENITAL ORGANS FIGURE 54 represents the urogenital apparatus of a thirty-inch female specimen of Alligator mississippiensis. Figure 55 shows the corresponding organs of a male A lucius;
More informationIn vitro Study of the Spermatozoa Motility in the Lizard Eutropis carinata
International Journal of Zoological Research 11 (3): 89-95, 2015 ISSN 1811-9778 / DOI: 10.3923/ijzr.2015.89.95 2015 Academic Journals Inc. In vitro Study of the Spermatozoa Motility in the Lizard Eutropis
More informationGENERAL SUMMARY. Observations
GENERAL SUMMARY Observations The seasonal variation in the gonadosomatic indices (GSI) of male and female confirmed that the spawning season of Lepidocephalus thermalis was from October to November, coinciding
More informationBIOL 2402 Reproductive Systems!
Dr. Chris Doumen! Female Reproductive Anatomy BIOL 2402 Reproductive Systems! Establishing the Ovarian Cycle During childhood, until puberty Ovaries grow and secrete small amounts of estrogens Estrogen
More information40a A&P: Reproductive System
40a A&P: Reproductive System 40a A&P: Reproductive System! Class Outline" 5 minutes" "Attendance, Breath of Arrival, and Reminders " 10 minutes "Lecture:" 25 minutes "Lecture:" 15 minutes "Active study
More informationMale Reproductive System
Male Reproductive System organs that function in: gamete and hormone production not all in abdominal cavity paired testicles = controlled by LH & FSH duct systems accessory glands Testis: Gross Histology
More informationBiology Homework Chapter 6: Continuity Through Reproduction Pages Answer the questions with complete thoughts!
Name Biology Homework Chapter 6: Continuity Through Reproduction Pages 143-158 Answer the questions with complete thoughts! Per. * Sections 6.1 and 6.2: Reproduction, Read pages 143 to 146 PART A: Define
More informationHealth Science: the structures & functions of the reproductive system
Health Science: the structures & functions of the reproductive BELLWORK 1. List (4) careers that are r/t the Reproductive, Urinary, and Endocrine Systems 2. Copy down the following terms: -ologist = one
More informationMale reproduction. Cross section of Human Testis ผศ.ดร.พญ.ส ว ฒณ ค ปต ว ฒ ภาคว ชาสร รว ทยา คณะแพทยศาสตร ศ ร ราชพยาบาล 1. Aims
Aims Male reproduction Male reproductive structure Spermatogenesis ส ว ฒณ ค ปต ว ฒ ห อง 216 โทร: 7578 Hypothalamo-pituitary-testicular axis Male sex hormone action Male reproductive structure Male reproductive
More informationEffects of Ablation of the Submaxillary Gland in Guinea Pigs IV. Cause of deterioration of the tubules in the testes
1961 475 Effects of Ablation of the Submaxillary Gland in Guinea Pigs IV. Cause of deterioration of the tubules in the testes Kazuo Suzuki Received August 1, 1960 Shakujii Institute, Tokyo Medical College,
More informationDOUBLE TEETH IN THE SPERM WHALE (PHYSETER MACROCEPHALUS L.)
DOUBLE TEETH IN THE SPERM WHALE (PHYSETER MACROCEPHALUS L.) by H. BOSCHMA Recently a fairly large number of teeth of the sperm whale were acquired for the collections of the Rijksmuseum van Natuurlijke
More informationStudy Guide Answer Key Reproductive System
Biology 12 Human Biology Textbook: BC Biology 12 Study Guide Answer Key Reproductive System 1. Distinguish between a gamete and a gonad using specific examples from the male and female systems. Gonads
More informationAnimal Science 434 Reproductive Physiology"
Animal Science 434 Reproductive Physiology" Embryogenesis of the Pituitary and Sexual Development: Part A Development of the Pituitary Gland" Infundibulum" Brain" Rathke s Pouch" Stomodeum" Germ Cell Migration"
More informationWhy Reproduce? In order to ensure the continuation of the species and the continuation of life in general by producing offspring
HUMAN REPRODUCTION Why Reproduce? In order to ensure the continuation of the species and the continuation of life in general by producing offspring Asexual vs Sexual Reproduction Remember: Asexual reproduction:
More informationSexual Differentiation Fall 2008 Bios 90
Sexual Differentiation Fall 2008 Bios 90 Jennifer Swann, Professor Dept Biol Sci, Lehigh University Asexual reproduction Budding : offspring develop as a growth on the body of the parent jellyfishes, echinoderms,
More informationFemale Reproductive System. Lesson 10
Female Reproductive System Lesson 10 Learning Goals 1. What are the five hormones involved in the female reproductive system? 2. Understand the four phases of the menstrual cycle. Human Reproductive System
More informationThe Reproductive System
PowerPoint Lecture Slide Presentation by Patty Bostwick-Taylor, Florence-Darlington Technical College The Reproductive System 16PART A The Reproductive System Gonads primary sex organs Testes in males
More informationThe Cell Life Cycle. S DNA replication, INTERPHASE. G 2 Protein. G 1 Normal THE CELL CYCLE. Indefinite period. synthesis. of histones.
Mitosis & Meiosis The Cell Life Cycle INTERPHASE G 1 Normal cell functions plus cell growth, duplication of organelles, protein synthesis S DNA replication, synthesis of histones THE CELL CYCLE M G 2 Protein
More informationAnimal Science 434 Reproductive Physiology
Animal Science 434 Reproductive Physiology Development of the Pituitary Gland Lec 5: Embryogenesis of the Pituitary and Sexual Development Stomodeum Brain Infundibulum Rathke s Pouch Germ Cell Migration
More informationHigh temperature injuries in tomato. V. Fertilization and development of embryo with special reference to the abnormalities caused by high temperature
High temperature injuries in tomato. V. Fertilization and development of embryo with special reference to the abnormalities caused by high temperature SHUICHI IWAHORI Faculty of Agriculture, University
More informationTHE SPECIFIC CHARACTERS OF SACCULINA ROTUNDATA MIERS AND SACCULINA YATSUI NOV. SPEC.
THE SPECIFIC CHARACTERS OF SACCULINA ROTUNDATA MIERS AND SACCULINA YATSUI NOV. SPEC. by H. BOSCHMA In a previous paper (Boschma, 1935) I made some remarks concerning the parasites of Pachygrapsus crassipes
More informationNotes on Reproduction of the Mexican Garter Snake, Thamnophis eques (Serpentes: Colubridae), from Mexico
Transactions of the Illinois State Academy of Science received 11/17/03 (2004), Volume 97, #2, pp. 129-134 accepted 3/21/04 Notes on Reproduction of the Mexican Garter Snake, Thamnophis eques (Serpentes:
More informationStudent Academic Learning Services Page 1 of 5 Reproductive System Practice
Student Academic Learning Services Page 1 of 5 Reproductive System Practice Fill in the blanks using the words listed: accessory glands, vas deferens, penis, scrotum, fallopian tube, testes, urethra, vagina,
More informationChapter 16: Steroid Hormones (Lecture 17)
Chapter 16: Steroid Hormones (Lecture 17) A) 21 or fewer carbon atoms B) Precursor: 27 carbon cholesterol C) major classes of steroid hormones 1) progestagens a) progesterone- prepares lining of uterus
More information10.7 The Reproductive Hormones
10.7 The Reproductive Hormones December 10, 2013. Website survey?? QUESTION: Who is more complicated: men or women? The Female Reproductive System ovaries: produce gametes (eggs) produce estrogen (steroid
More informationLeifer: Introduction to Maternity & Pediatric Nursing, 6th Edition
Leifer: Introduction to Maternity & Pediatric Nursing, 6th Edition Chapter 02: Human Reproductive Anatomy and Physiology Test Bank MULTIPLE CHOICE 1. A 14-year-old boy is at the pediatric clinic for a
More informationPeripatus ceramensis, n. sp.
PEBIPATCTS OEK-AMBNSIS. 737 Peripatus ceramensis, n. sp. By F. Miiii- si ml.. C. Kcrsliaw. With Plate 19. Female. Antennas dark grey, the articulations thinly ringed with ochreous. Eyes shiny black. Oral
More informationa. the tail disappears b. they become spermatids c. they undergo capacitation d. they have been stored in the uterus for several days
(2 points each) Multiple Choice. Read each question thoroughly before answering. From the choices available, choose the answer that is the most correct. Place all answers on the accompanying answer sheet.
More informationPHOTOPERIODIC CONTROL OF THE TESTICULAR CYCLE IN THE EASTERN RED-WINGED BLACKBIRD, (AGELAIUS PHOENICEUS PHOENICEUS)
University of Nebraska - Lincoln DigitalCommons@University of Nebraska - Lincoln Bird Control Seminars Proceedings Wildlife Damage Management, Internet Center for September 1970 PHOTOPERIODIC CONTROL OF
More informationAnimal Reproduction Chapter 46. Fission. Budding. Parthenogenesis. Fragmentation 11/27/2017
Animal Reproduction Chapter 46 Both asexual and sexual reproduction occur in the animal kingdom Sexual reproduction is the creation of an offspring by fusion of a male gamete (sperm) and female gamete
More informationHuman Reproductive Anatomy The female anatomy first just the reproductive parts:
Human Reproduction: Structures, Functions, and Hormones Human reproduction differs from the mechanisms in lower vertebrates and many invertebrates. We depend on internal fertilization sperm are deposited
More informationTHE EFFECT OF OESTRIN ON THE TESTIS OF THE ADULT MOUSE
389 THE EFFECT OF OESTRIN ON THE TESTIS OF THE ADULT MOUSE BY MARJORIE ALLANSON. (Harold Row Research Scholar, King's College, London.) (Received 5th March, 1931.) (With One Plate.) I. INTRODUCTION. THE
More informationGonad Development and Histology in Bagrus Bayad Cultured in Outdoor Earthen Ponds
"Science Stays True Here" Biological and Chemical Research, Volume 2014, 52-65 Science Signpost Publishing Gonad Development and Histology in Bagrus Bayad Cultured in Outdoor Earthen Ponds Tsadu S.M. *,
More informationSex Determination and Development of Reproductive Organs
Sex Determination and Development of Reproductive Organs Sex determination The SRY + gene is necessary and probably sufficient for testis development The earliest sexual difference appears in the gonad
More informationObjectives: 1. Review male & female reproductive anatomy 2. Gametogenesis & steroidogenesis 3. Reproductive problems
CH. 15 - REPRODUCTIVE SYSTEM Objectives: 1. Review male & female reproductive anatomy 2. Gametogenesis & steroidogenesis 3. Reproductive problems 3. Male Reproductive anatomy and physiology. Testes = paired
More informationUnit 15 ~ Learning Guide
Unit 15 ~ Learning Guide Name: INSTRUCTIONS Complete the following notes and questions as you work through the related lessons. You are required to have this package completed BEFORE you write your unit
More informationHuman Anatomy Unit 3 REPRODUCTIVE SYSTEM
Human Anatomy Unit 3 REPRODUCTIVE SYSTEM In Anatomy Today Male Reproductive System Gonads = testes primary organ responsible for sperm production development/maintenan ce of secondary sex characteristics
More information(Communicated at the meeting of April 23, 1949.)
Zoology. - Spermiation in Rana and Salamandra. Preliminary note 1). By G. J. VAN OORDT, F. CREUTZBERG and N. SPRaNK. (Zoological Laboratory, Dept. of Endocrinology, University of Utrecht.) (Com~ munioated
More informationWeb Activity: Simulation Structures of the Female Reproductive System
differentiate. The epididymis is a coiled tube found along the outer edge of the testis where the sperm mature. 3. Testosterone is a male sex hormone produced in the interstitial cells of the testes. It
More informationREPRODUCTIVE SYSTEM OBJECTIVES
REPRODUCTIVE SYSTEM OBJECTIVES OBJECTIVES: 1. List the organs and functions of the reproductive system. Female Organs Male Organs Functions 1 OVARIES 1 TESTES 1 Produce gametes 2 fallopian tubes 2 scrotum
More information