Biology: Concepts and Investigations
4th Edition
ISBN: 9780078024207
Author: Mariëlle Hoefnagels Dr.
Publisher: McGraw-Hill Education
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Chapter 9.7, Problem 1MC
Summary Introduction
To explain:
The way through which the polyploid offspring can be developed if the during meiosis I in one of the parent lead to nondisjunction of all the chromosomes whereas the other parent contributes normal number of chromosomes.
Concept introduction:
The non-disjunction of the chromosomes refers to the non-separation of chromosomes during either anaphase I or anaphase II of the cell cycle. This results in presence of an extra copy of chromosomes in the daughter cells.
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If nondisjunction occurs during meiosis I, how many of the daughter cells will have an incorrect number of chromosomes after meiosis I and meiosis II are complete?
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In an organism with a haploid number of , how many possible combinations of maternal and paternal chromosomes can occur in its gametes?
Select one:
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 Describe the process of non-disjunction and explain if it matters if it happens during meiosis I or meiosis II.
Chapter 9 Solutions
Biology: Concepts and Investigations
Ch. 9.1 - Prob. 1MCCh. 9.1 - How can asexually reproducing organisms acquire...Ch. 9.1 - Prob. 3MCCh. 9.2 - Prob. 1MCCh. 9.2 - Review figure 7.8, which shows that a chromosome...Ch. 9.3 - How do haploid and diploid nuclei differ?Ch. 9.3 - Prob. 2MCCh. 9.3 - Prob. 3MCCh. 9.3 - Prob. 4MCCh. 9.4 - What happens during interphase
Ch. 9.4 - How do the events of meiosis I and meiosis II...Ch. 9.5 - Prob. 1MCCh. 9.5 - Prob. 2MCCh. 9.5 - How are identical twins different from fraternal...Ch. 9.6 - Prob. 1MCCh. 9.6 - In what ways are mitosis and meiosis different?Ch. 9.7 - Prob. 1MCCh. 9.7 - How can deletions, duplications, inversions, and...Ch. 9.8 - What are the stages of sperm development in...Ch. 9.8 - Prob. 2MCCh. 9.8 - How does gamete production in plants differ from...Ch. 9.9 - Prob. 1MCCh. 9.9 - Prob. 2MCCh. 9 - Prob. 1MCQCh. 9 - Meiosis explains why a. you inherited half of your...Ch. 9 - Prob. 3MCQCh. 9 - Prob. 4MCQCh. 9 - Prob. 5MCQCh. 9 - Prob. 6MCQCh. 9 - Explain why evolution often selects traits that...Ch. 9 - Describe a situation in which asexual reproduction...Ch. 9 - Sketch the relationships among mitosis, meiosis,...Ch. 9 - Prob. 4WIOCh. 9 - How are the members of a homologous pair similar...Ch. 9 - Prob. 6WIOCh. 9 - Draw all possible metaphase I chromosomal...Ch. 9 - In some animals, females can reproduce by...Ch. 9 - List examples of abnormalities in chromosome...Ch. 9 - Prob. 10WIOCh. 9 - Prob. 11WIOCh. 9 - Prob. 12WIOCh. 9 - 1. Review section 9.5 and the Survey the Landscape...Ch. 9 - 2. Fit the following terms into this concept map:...Ch. 9 - 3. Create a separate concept map that includes...
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- Assume that a meiotic-nondisjunction event causes trisomy 8 in a newborn. If two of the three copies of chromosome 8 are absolutely identical, at what point during meiosis did the nondisjunction event take place?arrow_forwardIn the following diagram, designate each daughter cell as diploid (2n) or haploid (n).arrow_forwardExplain how the random alignment of homologous chromosomes during metaphase I contributes to variation in gametes produced by meiosis.arrow_forward
- Nondisjunction can be caused by ________. a. crossing over in meiosis b. segregation in meiosis c. failure of chromosomes to separate during meiosis d. multiple independent assortmentsarrow_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_forwardShow via a diagram how the product(s) of a meiotic (either I or II) nondisjunction involving the X chromosome of a human female could, when fertilized by a normal male gamete, result in an offspring with Kleinfelter’s syndrome.arrow_forward
- Given a diploid number of 2N=8 and two crossing-over events, trace the fate of these chromosomes through the stages of meiosis until the formation of daughter cells in meiosis II.arrow_forwardList two differences between meiosis I and meiosis II.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_forward
- In a comparison of the stages of meiosis to the stages of mitosis, which stages are unique ... to meiosis and which stages have the same events in both meiosis and mitosis?arrow_forwardBriefly illustrate how nondisjunction in meiosis can result in Down syndrome.arrow_forwardIf two traits, dwarfism and stem color, were both on the same pair of chromosomes, would you expect an F2 generation of 9:3:3:1 for a dihybrid cross? Use Medel's laws and your understanding of meiosis to explain your answer.arrow_forward
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