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 2NST
An organism has a diploid number of 16 in a primary oocyte, (a) How many tetrads are present in the first meiotic prophase? (b) How many dyads are present in the second meiotic prophase? (c) How many monads migrate to each pole during the second meiotic anaphase?
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Students have asked these similar questions
If nondisjunction occurs in humans for one pair of homologous chromosomes during meiosis I. The other pairs segregate normally.
a) Will any normal gametes result?
b) How many chromosomes will each human gametehave?
If nondisjunction occurs in humans for sister chromatids during meiosis II. The other pairs segregate normally.
a) Will any normal gametes result?
b) How many chromosomes will each human gamete have?
Several cells like the one represented below undergo a normal meiosis I and meiosis II, so that each cell produces four daughter cells.
One or more of these daughter cells are shown below. Which one(s) could they/could it be?
a)
b)
c)
d)
(i)Draw a diagram of Metaphase I and II of meiosis in the father, which illustrates the only possible way in which the father’s chromosomes could have aligned during Metaphase I, and in the subsequent Metaphase II in the same cell, in order to have resulted in the conception of the specific son who has all three of these genetic conditions (achondroplasia, color blindness and deafness).
(ii) Then, in the final set of diagrams, show the specific genes and chromosomes present in each of the four gametes that would have resulted from this series of events during meiosis I and II in the father.
(iii) Indicate which gamete or gametes produced by the father could have been involved in the son’s conception, by labeling the gamete(s) with an ARROW.
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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- Which 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_forwardDuring oogenesis in an animal species with a haploid number of 6, one dyad undergoes nondisjunction during meiosis II. Following the second meiotic division, this dyad ends up intact in the ovum. How many chromosomes are present in (a) the mature ovum and (b) the second polar body? (c) Following fertilization by a normal sperm, what chromosome condition is created?arrow_forward(d) With the random segregation of dyads, how many possible combinations are there at the end of meiosis for a diploid number of 10? (e) If half the chromosomes of a human primary oocyte segregate into the first polar body, which degenerates, why aren't some of the different kinds of chromosomes of the diploid chromosome complement absent from the egg? (f)What is the significance of the formation of polar bodies?arrow_forward
- If nondisjunction occurs in humans for one pair of homologous chromosomes during meiosis I. The other pairs segregate normally. a) Will any normal gametes result? b) How many chromosomes will each human gamete have? If nondisjunction occurs in humans for sister chromatids during meiosis II. The other pairs segregate normally. a) Will any normal gametes result? b) How many chromosomes will each human gamete have?arrow_forwardA) Hoe many cells are produced by the end of meiosis II? B) Are the cells produced at the end of meiosis II haploid or diploid? C) Are the chromosomes of the four final meiotic products replicated or nonreplicated?arrow_forwardIf an non disjunction occurs in meiosis 2 in a male and the resulting sperm fertilizes a normal female egg, which of the following coujld result. Check ALL that apply a) YO b) XYY c) XXY d) XXX e) XO Polar bodies are formed during Male meiosis Female meiosis Both male and female meiosis Neither male nor female meiosis A brain cell in a normal human male would have a Y chromosome. a) True b) Falsearrow_forward
- A 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_forwardA) At the end of meiosis I, how many chromosomes are in each cell? B) Are the cells haploid or diploid? C) Are the chromosomes of the meiosis I products replicated or nonreplicated? D) During which phase in meiosis I would crossing over have occurred?arrow_forwardimagine a giraffe whose diploid is 30. A) what # of chromosomes will be present in a somatic cell at prophase of mitosis? B) what will be the # of chromosomes present in a somatic cell at prophase 2 of meiosis?arrow_forward
- imagine a giraffe whose diploid is 30. A)Under what circumstances would the giraffe go through a process of meiosis? . b) what will be the final result of this meiosis for the giraffe (# of cells + # of chromosomes/cells)arrow_forwardIn a cell that has just begun the process of meiosis, as shown, what is the probability that a resulting gamete will have only maternally inherited chromosomes? (blue chromosomes are paternally inherited, red are maternally inherited) a) 1/4 b) 1/2 c) 1/8 d) 1/16 e) 1/32arrow_forwardWhich of the following does not occur in meiosis? (a) (b) (c) Homologous pairs form tetrads. Haploid nuclei are formed. Crossing over occurs. (d) Four ova are formed.arrow_forward
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