Biological Science, Books a la Carte Plus Mastering Biology with Pearson eText -- Access Card Package (6th Edition)
6th Edition
ISBN: 9780134296029
Author: Scott Freeman, Kim Quillin, Lizabeth Allison, Michael Black, Greg Podgorski, Emily Taylor, Jeff Carmichael
Publisher: PEARSON
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Chapter 13, Problem 9TYPSS
QUANTITATIVE Meiosisresults in independent assortment of maternal and paternal chromosomes. If n = 3 for a given organism, and there is no crossing over, what is the chance that a gamete will receive only paternal chromosomes?
a. 0; b. 1/16; c. 1/8; d. 1/3
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explain how the Law of Segregation and the Law of Independent Assortment relate directly to chromosome movements during meiosis. Which particular stages of meiosis demonstrate each of these two laws?
Non disjunction occurs when chromosomes fail to separate during meiosis, resulting in an
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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.
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 13 Solutions
Biological Science, Books a la Carte Plus Mastering Biology with Pearson eText -- Access Card Package (6th Edition)
Ch. 13 - CAUTION What are homologous chromosomes? a....Ch. 13 - What is an outcome of genetic recombination? a....Ch. 13 - What proportion of chromosomes in a man's skin...Ch. 13 - Nondisjunction that leads to problems in offspring...Ch. 13 - Explain the relationship between homologous...Ch. 13 - If you followed a woman's cells through meiosis,...Ch. 13 - 7. CAUTION Dogs have 78 chromosomes in their...Ch. 13 - Prob. 8TYUCh. 13 - QUANTITATIVE Meiosisresults in independent...Ch. 13 - 10. PROCESS OF SCIENCE A species of rotifer, a...
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- 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.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_forwardIn 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_forward
- When does crossing over usually occur, and what is the endresult?a. It occurs during prophase of meiosis I, and the end result isthe exchange of pieces between homologouschromosomes.b. It occurs during prometaphase of meiosis I, and the endresult is the exchange of pieces between homologouschromosomes.c. It occurs during prophase of meiosis I, and the end result isthe separation of sister chromatids.d. It occurs during prometaphase of meiosis I, and the endresult is the separation of sister chromatids.arrow_forwardGive typing answer with explanation and conclusionarrow_forwardIf a diploid organism has 14 chromosomes (2n=14) a. How many chromosomes will its gametes have? b. After meiosis I during gamete formation, how many chromosomes are in each daughter cell? c. After meiosis I during gamete formation, how many chromatids are in each daughter cell?arrow_forward
- Which case of nondisjunction is MOST likely to result in the production of an aneuploid cell? A. nondisjunction in meiosis I because two of the resulting cells will be n+1 and two will be n–1 B. nondisjunction in meiosis I because two of the resulting cells will be n; one will be n+1 and one will be n–1 C. nondisjunction in meiosis II because two of the resulting cells will be n+1 and two will be n–1 D. nondisjunction in meiosis II because all four resulting cells will be n; one will be n+1 and one will be n–1arrow_forwardDraw a diagram to show how nondisjunction of all chromosomesduring meiosis I in one parent could lead to polyploid offspring.(Use 2n = 6 for the starting cells; assume the other parent’s gametecontributes the normal number of chromosomes.)arrow_forwardIt 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.arrow_forward
- Briefly illustrate how nondisjunction in meiosis can result in Down syndrome.arrow_forwardA diploid organism produces four gametes from one parent cell through the process of meiosis. Two gametes are found to have 5 chromosomes, one gamete is found to have 6 chromosomes and one gamete is found to have 4 chromosomes. 1. 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. 2. Determine the number of homologous chromosome pairs that the original parent cell contained, before meiosis began. Explain how you determined this value.arrow_forwardList 3 important events that occur during meiosis and provide a justification why each should happen at a specific stage.arrow_forward
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