To examine: The similar events occurring in human males and females.
Introduction: Meiosis is a type of cell division that occurs in reproductive cells. This results in formation of four daughter cells. The meiotic process is called reductional division because it generates haploid cells that have half the chromosome number to that of parent cell. In this process, four daughter cells are produced, but only one form egg cell and the other three daughter cells degenerate. Sperm production also occurs by meiosis, but unlike in females four daughter spermatids are formed. Meiosis in male reproductive cell is complete once started, but in female reproductive cells meiosis gets interrupted.
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- If gametes had the same number of chromosomes as body cells, and an organism had 24 chromosomes in its body cells, how many chromosomes would it have after three generations? How does this illustrate the necessity of meiosis for gamete formation?arrow_forwardYou are observing fertilization in the lab and notice that a gamete underwent meiotic non-disjunction. Explain two possible outcomes for the zygote that will arise from this gamete?arrow_forwardFor which of the following is the number the same in humanmales and females?(A) interruptions in meiotic divisions(B) functional gametes produced by meiosis(C) meiotic divisions required to produce each gamete(D) different cell types produced by meiosisarrow_forward
- Given that a diploid cell will undergo meiosis and give rise to gametes (egg or sperm cells), where in the body would you expect this cell to be located?arrow_forwardIf two sperm cells were able to fertilize the same oocyte, how many chromosomes would the zygote have?arrow_forwardIn humans:a. How many sperm develop from 100 primaryspermatocytes?b. How many sperm develop from 100 secondaryspermatocytes?c. How many sperm develop from 100 spermatids?d. How many ova develop from 100 primary oocytes?e. How many ova develop from 100 secondaryoocytes?f. How many ova develop from 100 polar bodies?arrow_forward
- If there are 7 spermatogonium that will undergo cell division, how many functional spermatozoa will be formed?arrow_forwardA sperm cell from the fruit fly Drosophila melanogaster contains four chromosomes. How many chromosomes would be present in a spermatogonial cell about to enter meiosis? How many chromatids would be present in a spermatogo- nial cell at metaphase I of meiosis? How many would be present at metaphase II?arrow_forwardDuring meiosis in male mammals, sex chromosomes segregate to produce two types of sperm: X‑bearing sperm and Y‑bearing sperm. True or false?arrow_forward
- In human spermatogenesis, mitosis of a stem cell gives rise to one cell that remains a stem cell and one cell that becomes a spermatogonium. Draw four rounds of mitosis for a stem cell and label; the daughter cells. For one spermatogonium, draw the cells it would produce from one round of mitosis followed by meiosis. Label the cells, and label mitosis and meiosis. What would happen if stem cells divided like spermatogonia?arrow_forwardThe Human Reproductive System Discuss and compare the products of meiosis in human females and males. How many functional gametes are produced from the daughter cells in each sex?arrow_forwardDraw a schematic diagram showing spermatogenesis vis-à-vis oogenesis. Label the stage of development and chromosome number of daughter cells at the following levels of maturation: (a) mitotic proliferation (b) meiosis I and II (c) maturation. Table 2: Spermatogenesis vis-à-vis Oogenesis Spermatogenesis Oogenesisarrow_forward
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