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 33ESP
Assume that you were examining a first polar body and noted that it had one copy (dyad) of each chromosome except chromosome 21. Chromosome 21 was completely absent. What would you expect to be the chromosome 21 complement (only with respect to chromosome 21) in the secondary oocyte? What consequences are likely in the resulting zygote if the secondary oocyte was fertilized?
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Assume that you were examining a first polar body and noted that it had one copy (dyad) of each chromosome except chromosome 21. Chromosome 21 was completely absent. What would you expect to be the chromosome 21 complement (only with respect to chromosome 21) in the secondary oocyte? What consequences are likely in the resulting zygote if the secondary oocyte was fertilized?
If the 2n chromosome number of an organism is 12:
(a) what is the probability of having a spermatid with equal number of maternal and paternal chromosomes? (b) of a polar body containing at least two paternal chromosomes.
If a human gamete with a missing chromosome participates in fertilization with a gamete with a normal number of chromosomes, how many chromosomes will the zygote have? Will the zygote be viable? Explain your answer. (Remember, zygotes are diploid)
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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- In a zygote that begins with a complement of two homologous chromosomes pairs, A and a, and B and b: a. What chromosome compliments would you find in each somatic cells during growth? b. What combinations chromosomes would you expect to find in the gametes if the individual becomes an adult?arrow_forwardDescribe one function, brought about by the process of meiosis thatspermatogenesis and oogenesis have in common. Please write the similarities between spermatogenesis and oogenesis in a paragraph ratherthan a table. Please discuss the process mentioning differentiation, multiplication anddivision. How many stages of meiosis do they go through. Please mention if haploid ordiploid cells are formed.arrow_forwardIf a human gamete with an extra chromosome participates in fertilization with a gamete with a normal number of chromosomes, how many chromosomes will the zygote have? Explain your answer. (Remember, zygotes are diploid)arrow_forward
- (a) Do you see any differences between the onion and whitefish blastula cells in anaphase? (b) These cells are both undergoing mitosis. How would these cells be different if you were looking at a slide of anaphase I of meiosis instead?arrow_forwardWhich statement is true of meiosis? 1)two identical cells in both divisions 2)the first division produces haploid cells and the second produces diploid cells 3)the first division produces diploid cells and the second produces haploid cells 4) the products of both meiotic divisions are haploidarrow_forwardMeiosis is an important cellular process for organisms that reproduce sexually. Two lab partners (A and B) are shown this diagram of a meiotic cell and asked to identify its phase. Partner A believes that this cell is in prophase of the first meiotic division. Partner B believes that this cell has moved past prophase of meiosis I and is in a later phase of meiosis. Which partner is correct, and what evidence accurately would defend their belief? Partner A is correct. The chromosomes have clearly replicated during interphase and are beginning to decondense into chromatin. O Partner A is correct. The nuclear membrane is beginning to re-form and centrioles are beginning to migrate to opposite poles of the cell. Partner B is correct. Homologous chromosomes are no longer paired together, so the cell must be in first phase of meiosis II, not meiosis I. O Partner B is correct. The cell plate is beginning to form between the two centrioles, indicating the cell is actually in later phase of…arrow_forward
- A diploid cell contains three pairs of homologous chromosomes designated C1 and· C2, M1 and M2, and S1 and S2; no ·crossing over occurs. What possible combinations of chromosomes will be present in (a) daughter cells following mitosis (b) the first meiotic metaphase (c) haploid cells following both divisions of meiosis? For your answer give the number, show your work and clearly designate if the response is for part(a), (b), or (c)arrow_forwardIn a possible future scenario, male fertility drops to zero, but, luckily, scientists develop a way for women to pro-duce babies by virgin birth. Meiocytes are converted di-rectly (without undergoing meiosis) into zygotes, which implant in the usual way. What would be the short- andlong-term effects in such a society?arrow_forwardDescribe the final cellular products produced when a primary oocyte undergoes meiosis (I and II) in human females. four haploid oocytes 1 diploid oocyte and 3 polar bodies 1 haploid oocyte and 2 polar bodies two genetically identical daughter cells four genetically identical daughter cellsarrow_forward
- In which meiotic division does the separation of the homologous occur? What are the ploidies of the generated cells after the end of that process?arrow_forwardA diploid organism produces four gametes from one parent cell through the process of meiosis. Two gametes are found to have 7 chromosomes and two gametes are found to have 5 chromosomes. A) Is this the expected number of chromosomes that would be found in each gamete following a normal cycle of meiosis? If yes, explain why. If no, explain why not and describe how the gamete situation described above occurred. B) Determine the number of homologous chromosome pairs that the original parent cell contained, before meiosis began. Explain how you determined this value.arrow_forwardMale honeybees, which are haploid, produce sperm by meiosis.Explain what unusual event (compared with other animals) mustoccur during spermatogenesis in honeybees to produce sperm.Does this unusual event occur during meiosis I or meiosis II?arrow_forward
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Mitochondrial mutations; Author: Useful Genetics;https://www.youtube.com/watch?v=GvgXe-3RJeU;License: CC-BY