Gametogenesis. To complete this worksheet, select: Module: Continuity Activity: Animations Title: Gametogenesis. Introduction
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1 Gametogenesis To complete this worksheet, select: Module: Continuity Activity: Animations Title: Gametogenesis Introduction 1. a. Define gametogenesis. b. What cells are gametes? c. What are the two cell division processes that occur during the cell cycle? d. Define the cell cycle. The Cell Cycle and Interphase 2. Identify the two primary parts of the cell cycle. 3. What s happening during cellular interphase? 4. Describe cellular events during G Describe S phase activities. 6. Describe how DNA replication begins during the S phase.
2 7. Describe how new DNA strand forms and ultimately produce two identical DNA molecules. 8. What happens during the G 2 phase of interphase? Mitotic Cell Division 9. What is produced by the mitotic (M) phase of the cell cycle? 10. What is the function of mitotic cell division? 11. Define the two mitotic cell processes. 12. What happens to cellular DNA during the four stages of mitosis? 13. Describe events during prophase. 14. Describe events during metaphase. 15. a. Describe events during anaphase. b. Describe cytokinesis.
3 16. Describe events during telophase. Meiotic Cell Division 17. Meiosis is a cell division that creates daughter cells that are different from the parent cell. Explain. 18. Somatic cells are body cells, those other than reproductive. Contrast the chromosomes of somatic cells and gametes. 19. Contrast meiotic and mitotic cell divisions. How do they differ as processes and how are their products different? 20. Meiosis involves two cell divisions called Meiosis I and Meiosis II. Meiosis I is mechanically similar to mitosis with two notable exceptions. a. What is synapsis? b. What is crossing over? Genetic variation created by crossing over is beneficial. It shuffles human genes in new combinations providing variety and diversity essential to species survival. c. Describe a meiotic difference that occurs during Metaphase I. 21. During interphase, the DNA has replicated so the chromosomes that appear during prophase are actually doubled. The structure they form is called a tetrad. During mitotic anaphase, the tetrad splits moving a copy of each homologous chromosome to each daughter cell. This produces two daughter cells identical to each other and identical to the parent cell. This ISN T what happens in Anaphase I of meiosis, however. Explain.
4 22. Explain why the daughter cells produced by Meiosis I are haploid? At this point, the meiotic daughter cells contain BOTH copies of one chromosome. They are called sister chromatids. 23. Why is the chromatid activity of anaphase II similar to the activity in mitotic anaphase? 24. Describe the chromosome complement of the meiotic daughter cells. Spermatogenesis 25. a. Define spermatogenesis. b. Where does this process occur? 26. a. Describe the developmental events of the spermatogonia cells. b. If you didn t do so above, describe development of a primary spermatocyte. 27. Describe how two secondary spermatocytes are formed. 28. Describe how spermatids are formed.
5 29. Describe spermiogenesis. Oogenesis 30. a. Define oogenesis. b. Where does the process occur? c. When do oogonia cells develop? 31. Describe production of oogonia cells. 32. What is a primordial follicle? 33. a. Describe primary oocyte development. b. Oogonia cells begin prophase I during fetal development. This division, however, is stopped prior to birth. When is meiosis I completed? 34. Following puberty, each month a primary oocyte is stimulated to complete the first meiotic division. Describe this development. 35. a. Describe secondary oocyte formation within a graafian follicle.
6 b. What is the function of the first polar body (you ll have to do some thinking on this one)? c. Describe what happens to the secondary oocyte. 36. a. The secondary oocyte is suspended within meiosis II. Describe the development of these cells with and without fertilization. b. If fertilization occurs, a second polar body is formed which then degenerates. What is the function of the polar body? (Again, a little thought is needed.) 37. Describe zygote formation.
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