EBK BIOLOGY
5th Edition
ISBN: 8220101337627
Author: Maier
Publisher: PEARSON
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Textbook Question
Chapter 22, Problem 7LTB
Gametogenesis _________ .
A. begins at puberty in males and females;
B. requires that the Leydig cells of males produce semen; results in the production of diploid cells from haploid cells;
C. begins at puberty in female;
D. requires that meiosis halve the chromosome number so that sperm and eggs carry half the number of chromosomes as non-gametes.
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In humans, gametogenesis in both sexes relies on meiosis. However, spermatogenesis produces four gametes while oogenesis produces only one. Explain why this is so, including the specific structures or processes involved.
The diagram in Figure 1 shows a section through the mammalian testis. With reference to this diagram answer the following questions:
FIGURE 1
(a) What percentage of each of the following types of cells would you expect to contain an X chromosome.
Give a REASON for your answer in each case.
i) type cell A
ii) type cell B
(b)Name the cell type labelled B which under goes mitosis.
State the importance of mitosis in a mature testis.
Oogenesis in the female results in one functional gamete—the egg, or ovum. What other cells are produced? What is the significance of this rather wasteful type of gamete production—that is, production of a single functional gamete instead of four, as seen in males?
Chapter 22 Solutions
EBK BIOLOGY
Ch. 22 - Prob. 1LTBCh. 22 - Describe the male and female reproductive...Ch. 22 - Describe gametogenesis in males and females.Ch. 22 - A sperm cell follows which path? seminiferous...Ch. 22 - An egg cell that is not fertilized follows which...Ch. 22 - Which of the following is mismatched? urethra:...Ch. 22 - Gametogenesis _________ . A. begins at puberty in...Ch. 22 - Prob. 8LTBCh. 22 - Prob. 9LTBCh. 22 - Prob. 10LTB
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- a. The ovaries produce secondary the female sex cells. b. Stem cells, called divide by to produce primary each form part of a c. At the onset of puberty, tens of thousands of ovaries. Between menarche and menopause, each primordial follicle develops into a in the and its primary oocyte completes d. Some primary oocytes become 23-chromosome cells that begin then pause. secondary oocyte is released into is completed when e. Each month, the uterine tube. the oocyte isarrow_forwardSpermatocytes enter meiosis: A. Prior to the birth of the male infant. B. Withint daysof the birth of the male infant. C. When the male reaches puberty.arrow_forwardWhy is a second polar body expelled after fertilisation (select one) a. The oocyte must recativate the incomplete meiosis before fusing with the sperm b. To remove excess cytoplasm c. Before fusion with the sperm it must complete mitosis d. The fertilised oocyte is not a haploid cell until it expels the sperms mitochondriaarrow_forward
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- Which of the following statements is/are true? A. Spermatogenesis is an example of asymmetric cell division. B. The formation of a mature egg occurs through symmetric cell division. C. Spermatogenesis and oogenesis are both examples of asymmetric cell division. D. Spermatogenesis involves only symmetric cell division whereas oogenesis involves asymmetric cell division.arrow_forwardTC ARO YOUT C Which of the following events does not occur in spermatogenesis? (Circle the correct answer.) a. Diploid germ cells divide by mitosis to form diploid spermatogonia. b. Some of these spermatogonia divide by mitosis, forming haploid primary spermatocytes. c. The primary spermatocyte enters meiosis I, forming two haploid secondary spermatocytes. d. Two secondary spermatocytes undergo meiosis II, forming four spermatids. e. Spermatids mature into haploid sperm cells. PAO 7 In humans, spermatogenesis occurs in the seminiferous tubules of the testes. (Circle the correct answer.) True False . In plants, (Circle the correct answer.) a. the life cycle is different from that of animals in that plants alternate between diploid and haploid forms plants, and male gametes are produced in the anthers of flowersarrow_forwardExplain how a woman with an ovary removed from one side and a uterine tube removed from the other side can get pregnant (exclude the possibility of in vitro fertilization).arrow_forward
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