Guided Reading and Study. Definition a. The scientific study of heredity. b. Physical characteristics

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1 Genetics: The Science of Heredity Mendel's Work Guided Reading and Study This section describes how Gregor Mendel identified the method by which characteristics are passed from parents to their offspring. Use Target Reading Skills As you read, complete the outline about Mendel's work. use the red headingsfor the main idea and the blue headings for the supporting ideas. l. Mendel's experiments A. crossing pea plants B. c. D. B. c. D. Introduction 1. Gregor Mendel experimented with hundreds of pea plants to understand the process of Match the term with its definition. Term 2. heredity 3. genetics 4. traits Definition a. The scientific study of heredity b. Physical characteristics c. The passing of traits from parents to offspring Mendel's Experiments 5. In a flower, the female sex cells, or eggs, are produced by the Pollen, which contains the male sex cells, is produced by the 6. What are purebred organisms? Pearson Education, Inc., publishing os Pearson Prentice Hall. All rights reserved

2 Mendel's Work (continued) 7. Complete the flowchart below, which summarizes Mendel's first experiment with pea plants. C) Mendel's Experiment Purebred tall plants are crossed with purebred plants. Fl offspring are all Fl offspring are allowed to self-pollinate. F2 offspring are and 8. Circle the letter of other traits in garden peas that Mendel studied. a. seed size, seed shape, seed color b. seed color, pod color, flower shape c. flower size, pod shape, seed coat color d. pod color, seed shape, flower position 9. Two forms of the trait of seed shape in pea plants are and Dominant and Recessive Alleles 10. Circle the letter of each sentence that is true about alleles. a. Recessive alleles are never present when dominant alleles are present. b. Alleles are different forms of a gene. c. A trait controlled by a dominant allele always shows up in the organism when the allele is present. d. Recessive alleles hide dominant alleles. 11. Is the following sentence true or false? nly pea plants that have two recessive alleles for short stems will be short.

3 Match the pea plant with its combination of alleles. Pea Plant Combination of Alleles 12. purebred short 13. purebred tall 14. hybrid tall 15. A dominant allele is represented by a(n) letter. 16. A recessive allele is represented by a(n) letter. a. b. c. Two alleles for tall stems ne allele for tall stems and one allele for short stems Two alleles for short stems 17. How might a geneticist write the alleles to show that a tall pea plant has one allele for tall stems and one allele for short stems? 18. Is the following sentence true or false? Some scientists during Mendel's time thought Mendel should be called the Father of Genetics.

4 Probability and Heredity This section explains what probability is and how the laws ofprobability can be used in the study ofgenetics. Use Target Reading Skills After you read the section, reread the paragraphs that contain definitions of Key Terms. use all the information you have learned to write a definition of each Key Term in your own words. Principles of Probability 1. A number that describes how likely it is that an event will occur is called o 2. Circle the letter of each answer that equals the probability that a tossed coin will land heads up. a. 1 in 2 b. 1 /2 c. 50 percent d. 20 percent 3. Is the following sentence true or false? When you toss a coin 20 times, you will always get 10 heads and 10 tails. 4. If you toss a coin five times and it lands heads up each time, can you expect the coin to land heads up on the sixth toss? Explain.

5 Genetics: The Science of Heredity Probability and Heredity (contin ued) Probability and Genetics Guided Reading and Study 5. When Mendel crossed two hybrid plants for stem height (Tt), what results did he always get? 6. Mendel realized that the principles of probability could be used to the results of genetic crosses. 7. A chart that shows all the possible combinations of alleles that can result from a genetic cross is called a(n) 8. Write in the alleles of the parents and the possible allele combinations of the offspring in the Punnett square below. (Note that both parents are tall. Three of the offspring are tall and one is short.)

6 Genetics: The Science of Heredity Phenotypes and Genotypes Guided Reading and Study Match the term with its definition. Term Definition 9. phenotype a. Describes an organism with two identical alleles for a trait 10. genotype b. 11. homozygous An organism's physical appearance, or visible traits 12. heterozygous c. An organism's genetic makeup, or allele combinations d. Describes an organism that has two different alleles for a trait 13. Mendel used the term heterozygous pea plants. to describe Codominance 14. Is the following sentence true or false? In codominance, the alleles are neither dominant nor recessive. 15. In cattle, red hair and white hair are codominant. Cattle with both white hair and red hair are

7 The Cell and Inheritance This section describes how one set of chromosomes from each parent is passed on to the offspring. Use Target Reading Skills As you read, identify the evidence that supports the hypothesis that genes are found on chromosomes. Write the evidence in the graphic organizer below. Evidence Hypothesis Grasshoppers: 24 chromosomes in body cells, 12 in sex cells Chromosomes are important in inheritance. Chromosomes and Inheritance 1. Circle the letter of each sentence that is true about what Sutton observed about chromosome number. a. Grasshopper sex cells have half the number of chromosomes as body cells. b. Grasshopper body cells have half the number of chromosomes as sex cells. c. Grasshopper body cells and sex cells have the same number of chromosomes. d. When grasshopper sex cells join, the fertilized egg has the same number of chromosomes as the body cells of the parents. 2. What is the chromosome theory of inheritance? Meiosis 3. What is meiosis?

8 Name Da te Class The Cell and Inheritance (continued) 4. Complete the cycle diagram, which describes the events that occur during meiosis. Parent cell has four chromosomes arranged in pairs. Sex cells combine to produce offspring. Each offspring has chromosomes, one pair from each parent. Chromosome pairs and are distributed to sex cells. Each sex cell has 5. A Punnett square is a shorthand way to show the events that occur during 6. Is the following sentence true or false? During meiosis, the two alleles for each gene stay together. 7. If the male parent cell is heterozygous for a trait, Tt, what alleles could the sperm cells possibly have? chromosomes. A Lineup of Genes 8. How many pairs of chromosomes do human body cells contain? 9. How are the genes lined up in a pair of chromosomes?

9 8. List the two kinds of RNA and describe their jobs. a. b. 9. Circle the letter of the first step in protein synthesis. a. Transfer RNA carries amino acids to the ribosome. b. The ribosome releases the completed protein chain. c. Messenger RNA enters the cytoplasm and attaches to a ribosome. d. DNA "unzips" to direct the production of a strand of messenger RNA. 10. Circle the letter of the last step in protein synthesis. a. Transfer RNA carries amino acids to the ribosome. b. The protein chain grows longer as each transfer RNA molecule adds an amino acid. c. Messenger RNA enters the cytoplasm and attaches to a ribosome. d. DNA "unzips" to direct the production of a strand of messenger RNA. Mutations 11. What is a mutation? 12. How can mutations affect protein synthesis in cells? Pearson Education, inc., publishing as Pearson Prentice Hall. Ail rights reserved.

10 The DNA Connection (continued) 13. Circle the letter of each sentence that is true about mutations. a. Cells with mutations will always make normal proteins. b. Some mutations occur when one nitrogen base is substituted for another. c. Some mutations occur when chromosomes don't separate correctly during meiosis. d. Mutations that occur in a body cell can be passed on to an offspring. 14. Mutations can be a source of genetic 15. Is the following sentence true or false? All mutations are harmful. 16. Mutations that are improve an organism's chances for survival and reproduction. 17. Whether a mutation is harmful or helpful depends partly on an organism's

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