Concepts of Genetics (12th Edition)
12th Edition
ISBN: 9780134604718
Author: William S. Klug, Michael R. Cummings, Charlotte A. Spencer, Michael A. Palladino, Darrell Killian
Publisher: PEARSON
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Chapter 2, Problem 13PDQ
Contrast spermatogenesis and oogenesis. What is the significance of the formation of polar bodies?
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Draw 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
Oogenesis
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?
Describe the development of an oocyte from primordial follicle to when it is released at ovulation. How do hormones contribute to this progression? Describe the development of a spermatogonia to a spermatozoa. How do hormones contribute to this progression? What is the function of Sertoli and Leydig cells?
Chapter 2 Solutions
Concepts of Genetics (12th Edition)
Ch. 2 - With the initial appearance of the feature we call...Ch. 2 - An organism has a diploid number of 16 in a...Ch. 2 - Examine Figure 2.12, which shows oogenesis in...Ch. 2 - Over a period of two years, a man in his early 20s...Ch. 2 - Over a period of two years, a man in his early 20s...Ch. 2 - Over a period of two years, a man in his early 20s...Ch. 2 - In this chapter, we focused on how chromosomes are...Ch. 2 - Review the Chapter Concepts list on page 14. All...Ch. 2 - What role do the following cellular components...Ch. 2 - Discuss the concepts of homologous chromosomes,...
Ch. 2 - If two chromosomes of a species are the same...Ch. 2 - Describe the events that characterize each stage...Ch. 2 - How are chromosomes named on the basis of their...Ch. 2 - Contrast telophase in plant and animal mitosis.Ch. 2 - Describe the phases of the cell cycle and the...Ch. 2 - Define and discuss these terms: (a) synapsis, (b)...Ch. 2 - Contrast the genetic content and the origin of...Ch. 2 - Given the end results of the two types of...Ch. 2 - Contrast spermatogenesis and oogenesis. What is...Ch. 2 - Explain why meiosis leads to significant genetic...Ch. 2 - A diploid cell contains three pairs of homologous...Ch. 2 - Considering Problem 15, predict the number of...Ch. 2 - During oogenesis in an animal species with a...Ch. 2 - What is the probability that, in an organism with...Ch. 2 - The nuclear DNA content of a single sperm cell in...Ch. 2 - Describe the role of meiosis in the life cycle of...Ch. 2 - Contrast the chromatin fiber with the mitotic...Ch. 2 - Describe the folded-fiber model of the mitotic...Ch. 2 - Prob. 23PDQCh. 2 - If one follows 50 primary oocytes in an animal...Ch. 2 - In mitosis, what chromatid combination(s) will be...Ch. 2 - During meiosis I, assuming no crossing over, what...Ch. 2 - Are there any possible combinations present during...Ch. 2 - Draw all possible combinations of chromatids...Ch. 2 - Assume that during meiosis I none of the C...Ch. 2 - Assume that each gamete resulting from Problem 29...Ch. 2 - A species of cereal rye (Secale cereale) has a...Ch. 2 - An interesting procedure has been applied for...Ch. 2 - Assume that you were examining a first polar body...Ch. 2 - Kuliev and Verlinsky (2004) state that there was a...
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- Describe the events taking place during spermatogenesis? Match the different phase of spermatogenesis with he meiotic events taking place?arrow_forwardWhat may be the most likely reason for the existence of polar bodies? A) They act as a back-up in case the secondary oocyte becomes non-viable. B) They may be fertilized and produce a viable twin. C) They provide a structure for half of the chromosomes after cellular division. D) They add a hormonal stimulus necessary to trigger ovulation. E) They are important additional sources of estrogen.arrow_forwardDescribe the process of ovulation, the hormone involved and what is released into the Fallopian tube (It isn’t just the oocyte) . At what stage of meiosis is the secondary oocyte? What is the life expectancy of the secondary oocyte?arrow_forward
- Name the stages of spermatogenesis from spermatogonium to spermatozoa. How do they differ in the number ofchromosomes per cell and chromatids per chromosome?arrow_forwardWhy is a second polar body expelled after fertilisation? a) To remove excess cytoplasm b) Because the oocyte must reactivate the incomplete meiosis before fusing with the sperm 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_forwardList three ways in which oogenesis differs from spermatogenesis. Be specific!arrow_forward
- Briefly describe the function of the following: - spermatogenic cellarrow_forwardCite differencens between frog and chicken ovary. Cite differences of spermatogenesis on frog and chicken.arrow_forwardCompare oogenesis to spermatogenesis. How are the two processes similar? How do they differ? (Consider both follicle and sperm structure throughout development as well as the timing of the stages.)arrow_forward
- Spermatogenesis and oogenesis both involve meiosis but differ in significant ways. One of those differences include what? A) Cytokinesis is unequal in spermatogenesis B) Production of sperm is continuous; in humans, and the number of future egg cells is set at birth C) Oogenesis is an uninterrupted sequence, but there are long delays in spermatogenesis D) All of the abovearrow_forwardIf 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?arrow_forwardWhat are the similarities and differnces between spermatogenesis and oogenesis?arrow_forward
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