Human Heredity: Principles and Issues (MindTap Course List)
11th Edition
ISBN: 9781305251052
Author: Michael Cummings
Publisher: Cengage Learning
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Chapter 2, Problem 10QP
It is possible that an alternative mechanism for generating germ cells could have evolved. Consider meiosis in a germ cell precursor (a cell that is diploid but will go on to make gametes). If the S phase were skipped, which meiotic division (meiosis I or meiosis II) would no longer be required?
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It is possible that an alternative mechanism for generating germ cells could have evolved. Consider meiosis in a germ cell precursor (a cell that is diploid but will go on to make gametes). If the S phase were skipped, which meiotic division (meiosis I or meiosis II) would no longer be required? Explain.
Consider a diploid cell that has 2 n = 4 chromosomes: one pair of metacentric chromosomes and one pair of acrocentric chromosomes. Suppose that this cell undergoes nondisjunction, giving rise to an autotriploid cell (3 n). The triploid cell then undergoes meiosis. Draw the different types of gametes that could result from meiosis in the triploid cell, showing the chromosomes present in each type. To distinguish between the different metacentric and acrocentricchromosomes, use a different color to draw each metacentric chromosome; similarly, use a different color to draw each acrocentric chromosome.
Consider a diploid cell that has 2 n = 4 chromosomes: one pair of metacentric chromosomes and one pair of acrocentric chromosomes. Suppose that this cell undergoes nondisjunction, giving rise to an autotriploid cell (3 n). The triploid cell then undergoes meiosis. Draw the different types of gametes that could result from meiosis in the triploid cell, showing the chromosomes present in each type. To distinguish between the different metacentric and acrocentric chromosomes, use a different color to draw each metacentric chromosome; similarly, use a different color to draw each acrocentric chromosome.
Chapter 2 Solutions
Human Heredity: Principles and Issues (MindTap Course List)
Ch. 2 - Prob. 1CSCh. 2 - Prob. 2CSCh. 2 - Prob. 3CSCh. 2 - Cell Structure Reflects Function What advantages...Ch. 2 - Assign a function(s) to the following cellular...Ch. 2 - How many autosomes are present in a body cell of a...Ch. 2 - Define the following terms: a. chromosome b....Ch. 2 - Human haploid gametes (sperm and eggs) contain: a....Ch. 2 - Prob. 6QPCh. 2 - Prob. 7QP
Ch. 2 - In the cell cycle, at which stages do two...Ch. 2 - Does the cell cycle refer to mitosis as well as...Ch. 2 - It is possible that an alternative mechanism for...Ch. 2 - Identify the stages of mitosis, and describe the...Ch. 2 - Why is cell furrowing important in cell division?...Ch. 2 - A cell from a human female has just undergone...Ch. 2 - During which phases of the mitotic cycle would the...Ch. 2 - Describe the critical events of mitosis that are...Ch. 2 - Mitosis occurs daily in a human being. What type...Ch. 2 - Speculate on how the Hayflick limit may lead to...Ch. 2 - How can errors in the cell cycle lead to cancer in...Ch. 2 - List the differences between mitosis and meiosis...Ch. 2 - In the following diagram, designate each daughter...Ch. 2 - Which of the following statements is not true in...Ch. 2 - Match the phase of cell division with the...Ch. 2 - A cell has a diploid number of 6 (2n = 6). a. Draw...Ch. 2 - A cell (2n = 4) has undergone cell division....Ch. 2 - We are following the progress of human chromosome...Ch. 2 - What is physically exchanged during crossing over?Ch. 2 - Compare meiotic anaphase I with meiotic anaphase...Ch. 2 - Provide two reasons why meiosis leads to genetic...
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- Compare meiotic anaphase I with meiotic anaphase II. Which meiotic anaphase is most similar to the mitotic anaphase?arrow_forwardConsider a diploid cell that has 2n = 4 chromosomes: one pair of metacentric chromosomes and one pair of acrocentric chromosomes. Suppose that this cell undergoes nondisjunction, giving rise to an autotriploid cell (3n). The triploid cell then undergoes meiosis. Draw the different types of gametes that could result from meiosis in the triploid cell, showing the chromosomes present in each type. To distinguish between the different metacentric and acrocentric chromosomes, use a different color to draw each metacentric chromosome; similarly, use a different color to draw each acrocentric chromosome.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_forward
- Construct a table similar to that in Figure 2.12 for the different stages of meiosis, giving the number of chromosomes per cell and the number of DNA molecules per cell for a cell that begins with 4 chromosomes (two homologous pairs) in G1. Include the following stages in your table: G1, S, G2, prophase I, metaphase I, anaphase I, telophase I (after cytokinesis), prophase II, metaphase II, anaphase II, and telophase II (after cytokinesis).arrow_forwardThe diagram below shows a cell during Meiosis II: a) What phase of Meiosis II is the cell in? How do you know? b) Assuming all of the chromosomes present during Meiosis II are shown in the figure above, how many chromosomes (counting homologous pairs as two chromosomes) does a gamete from this organism have? c) Draw the same cell during the same phase of Meiosis I. Label the elementsarrow_forwardConstruct a table for the different stages of meiosis, giving the number of chromosomes per cell and the number of DNA molecules per cell for a cell that begins with 4 chromosomes (two homologous pairs) in G1. Include the following stages in your table: G1, S, G2, prophase I, metaphase I, anaphase I, telophase I (after cytokinesis), prophase II, metaphase II, anaphase II, and telophase II (after cytokinesis).arrow_forward
- In a description of meiosis the terms ‘chromosome’ and ‘chromatid’ may be used. Distinguish between these two terms. There are 56 chromosomes in a mature elephant cell. If one of the elephants cells responsible for gamete production undergoes meiosis, how many chromosomes would be present in each cell after meiosis I, and then after meiosis II. Explain your reasoning.arrow_forwardit is possible that an alternative mechanism for generating germ cells could have evolved. consider meiosis in a germ cell precursor. if the S shape were skipped, whic meiotic devision would no longer be required.arrow_forwardNon disjunction occurs when chromosomes fail to separate during meiosis, resulting in an abnormal number of chromosomes in the gametes. Assume an animal species has a diploid number of 4. Describe and/or show what the normal gametes would be like, and what would result from non disjunction in meiosis one, and what would result from non disjunction in meiosis two. You may use a drawing as part of your answer, but a drawing alone is not sufficient.arrow_forward
- Briefly explain why there is no interphase in between Meiosis I and Meiosis II.arrow_forwardIdentify two ways meiosis contributes to genetic recombination? Why is it necessary to reduce the number of chromosomes in gametes? Blue whales have 44 chromosomes in every cell. Determine how many chromosomes you would expect to find in the following: Cachalot whale Egg cell Daughter cell from mitosis Daughter cell from mitosis IIarrow_forwardGerm cells are specialized cells that develop into gametes. Gametes are produced through the process of meiosis. If the haploid number for monkeys is 27 chromosomes, how many chromosomes does a cell undergoing division have at each of the following phases? Select the row that correctly shows the number of chromosomes at each phase. Select one: a. G2 of Interphase Mitotic Metaphase Meiotic Metaphase I Meiotic Metaphase II 27 54 54 27 b. G2 of Interphase Mitotic Metaphase Meiotic Metaphase I Meiotic Metaphase II 54 27 27 27 c. G2 of Interphase Mitotic Metaphase Meiotic Metaphase I Meiotic Metaphase II 54 54 27 27 d. G2 of Interphase Mitotic Metaphase Meiotic Metaphase I Meiotic Metaphase II 54 54 54 27arrow_forward
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