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Human Heredity: Principles and Iss...

11th Edition
Michael Cummings
Publisher: Cengage Learning
ISBN: 9781305251052

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BuyFindarrow_forward

Human Heredity: Principles and Iss...

11th Edition
Michael Cummings
Publisher: Cengage Learning
ISBN: 9781305251052
Chapter 6, Problem 8QP
Textbook Problem
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Tetraploidy may result from:

  1. a. lack of cytokinesis in meiosis II
  2. b. nondisjunction in meiosis I
  3. c. lack of cytokinesis in mitosis
  4. d. nondisjunction in mitosis in the early embryo
  5. e. none of these

Summary Introduction

Introduction: Ploidy level is most important in organisms. Humans are diploid in nature and have 23 pairs of chromosomes, which are depicted as 2n. Any change in the number of chromosomes changes the ploidy level of the organism.

Explanation of Solution

Reason for the correct answer:

In mitosis, the chromosomes divide, and every chromosome have their copy of sister chromatids. If the cytokinesis fails, then the cells will not divide. Due to this, all the chromosomes are transferred to one cell, making 92 chromosomes (tetraploid).

Option c is given as, “lack of cytokinesis in mitosis.”

When an individual has four copies of each chromosome, it is termed as tetraploidy. Hence, the correct answer is option c.

Reasons for incorrect answers:

Option a is given as, “lack of cytokinesis in meiosis II.”

In the meiosis I the chromosomes are doubled, and they are separated in anaphase I. In meiosis II actual reduction in ploidy occurs in which the cell divides the chromosomes to get haploid cells. If the cytokinesis fails in meiosis II, then diploid gametes are produced. Hence, option a is incorrect.

Option b is given as, “nondisjunction in meiosis I...

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