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Which of the following cells is haploid? (a) primary oocyte (b) secondary oocyte (c) oogonium (d) cells of the corpus luteum (e) follicle cell
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- If one follows 50 primary oocytes in an animal through theirvarious stages of oogenesis, how many secondary oocytes wouldbe formed? How many first polar bodies would be formed? Howmany ootids would be formed? If one follows 50 primary spermatocytes in an animal through their various stages of spermatogenesis, how many secondary spermatocytes would beformed? How many spermatids would be formed?What structural and biochemical changes do the spermatid undergo during spermiogenesis? How do these changes help the future gamete in performing its role in fertilization?What structural and biochemical changes does the spermatid undergo during permiogenesis?How do these changes help the future gamete in performing its role in fertilization?
- How many somites are there in mouse? In chicks? In humansIf two sperm cells were able to fertilize the same oocyte, how many chromosomes would the zygote have?In comparing external and internal fertilization, what evolutionary change can be seen in the coats of ovulated eggs? Why? What about the sperm? Any changes?
- Why is it that the first trimester of pregnancy the most critical in humans? How will you relate it to process of gastrulation and primary organ formation in human embryos?Where does fertilization takes place in human female?If fertilization occurs, the corpus luteum continues to produce hormones under the direction of Human Chorionic Gonadotrophin (HCG), which is produced by the embryo. By the third month, what begins to produce estradiol and progesterone?