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3. List three ways in which oogenesis differs from spermatogenesis. Be specific!
OOGENESIS SPERMATOGENESIS
1.
2.
3.
4. If a chimpanzee has a haploid (N) chromosome number of 24, how many chromosomes will be
found in its zygote? (Highlight/underline one)
6 12 24 36 48 72 96
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- There are 6 major events in fertilization. Discuss the process of fertilization or conception, with emphasis on the sperm-egg interaction. Proteins on the sperm plasma membrane bind to ZP3 molecules within the zona pellucida of the egg. Why is this event important? Zona binding triggers the acrosome reaction, in which the sperm plasma membrane fuses with the outer acrosomal membrane, causing exocytosis of acrosomal contents. What is in the "acrosomal content"? Acrosomal enzymes begin to dissolve a hole in the zona pellucida. This enzymatic degradation, accompanied by rapid sperm tail beating, moves the sperm through the zona. Where does the sperm intend to reach?2. Compare and contrast gametogenesis of sperm and eggs in mammals. In your comparison, describe three similarities and three 3. Compare and contrast external versus internal fertilization. Describe at least three major differences. 4. What is meant by 'sperm competition'? What is 'second male advantage'? Describe the case study of Drosophila melanogaster in your text. 5. Describe the difference between oviparous, viviparous, and ovoviviparous. What evolutionary pressures would favor one form over the other? 6. Use your text to identify all the structures in the figures below. Also provide a brief description of each structures function. male reproduction anatomy 7. female reproductive anatomy24) The process of gametogenesis starts with a stem cell in the gonads and produces gametes used in sexual reproduction. For the process of spermatogenesis and oogenesis in mammals, complete the following table: Spermatogenesis Gamete type produced Location occurs Number of haploid cells produced Life-stage that the process begins Life-stage that the process ends Oogenesis
- Let's Check Activity 9. Let us try to check your understanding of the discussion. Read the questions carefully. Encircle the letter that corresponds to the correct answer. 1. Which of the following pairs share 50% of their genes? Any two siblings A pair of dyzogotic twins A pair of monozygotic twins a and b 2. Regarding types of multiple pregnancy, which of the following are true? a. Dizygotic twins result from fertilization of different oocytes by the same sperm. b. Monozygotic twins result from mitotic division of a single zygote into 'identical' twins. c. Dizygotic twins result from the division of a single fertilized egg. d. Monozygotic twins result from 2 egg cells merged together, eventually fertilized by a sperm cell. 3. Fraternal twins make up approximately. of the twin population.What would happen if the trophoblast did not secrete hCG upon implantation of the blastocyst? Tire cells would not continue to divide. Tire corpus luteum would continue to produce progesterone and estrogen. Menses would flush the blastocyst out of the uterus. Tire uterine mucosa would not envelop the blastocyst.Explain further each number 1. Compare and contrast the sequence of fertilization events that take place in the sea urchin vs. mammals. 2. How do the sperm and egg recognize each other? What molecules are involved?
- 1 3. Enzymes are important during the process of fertilization. What would be the anticipated consequences if the level of acrosin was low or non-existent in the acrosome? 5. The Sperm would not be able to break through the protective coat on the egg (zona pellucida). meaning the sperm are unable to fertilize anegg 4. The morula contributes to a layer that becomes the embryo and to cells that become the placenta. What are the names of these structures? Illustrate and label these layers/structures. What is the name of the outer cell layer of the blastocyst and what does it give rise to? Does this layer contribute to the development of the embryo? 6. Explain the origins of the blastocyst cavity and what purpose does it serve? 7. Describe implantation of a blastocyst using simple, labeled diagrams.Scenario 1: Examine the sketch of a diagram of an XY human male cell undergoing spermatogenesis. Then using the spaces provided, fill in the blanks for the scenarios described: "Normal Spermatogenesis" 2n=46 1n=23 1n=23 xX 1n=23 1n=23 Y 1n=23 1n=23asexual and šexual reproduction? 2. Compare and contrast gametogenesis of sperm and eggs in mammals. In your comparison, describe three similarities and three 3. Compare and contrast external versus internal fertilization. Describe at least three major differences. 4. What is meant by 'sperm competition'? What is 'second male advantage'? Describe the case study of Drosophila melanogaster in your text. 5. Describe the difference between oviparous, viviparous, and ovoviviparous. What evolutionary pressures would fauor onn
- What is NOT true about these statements on sexual reproduction? * 1 point Sexual reproduction is uniparental. Key processes in sexual reproduction are meiosis and fertilization. This process involves the production of sex cells or gametes. The union of two gametes resulting into a zygote is called fertilization.Meiosis in animals is responsible for the formation of what type of cells? (select all the apply)* Gametes Zygote Egg Germ Cells Sex Cells Sperm Body Cells Somatic Cells Mitosis in animals is responsible for the formation of what type of cells? (select all the apply) *The result of spermatogenesis is: 4 viable haploid spermatids. 1 viable haploid spermatid and 3 haploid polar bodies. 4 viable diploid spermatids. 1 viable diploid spermatids and 3 diploid polar bodies. Don't copy from Google
