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Biology: The Unity and Diversity o...

15th Edition
Cecie Starr + 3 others
Publisher: Cengage Learning
ISBN: 9781337408332

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Chapter
Section
BuyFindarrow_forward

Biology: The Unity and Diversity o...

15th Edition
Cecie Starr + 3 others
Publisher: Cengage Learning
ISBN: 9781337408332
Chapter 14, Problem 8SQ
Textbook Problem
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Nondisjunction in meiosis can result in ________.

  1. a. base-pair substitutions
  2. b. aneuploidy
  3. c. crossing over
  4. d. pleiotmpy

Summary Introduction

Introduction: During sexual reproduction, meiosis is a process of cell division where chromosome number is reduced to half. Its purpose is the formation of gametes. The homologous chromosomes randomly align with their homologs at metaphase I. The chromosomes are randomly paired and segregated to opposite poles.

Explanation of Solution

Reason for the correct statement:

There are certain cases when homologous chromosomes fail to separate during meiosis. This causes non-disjunction leading to aneuploidy. Aneuploidy is a chromosome aberration where an individual has either less or additional number of chromosomes than the wild type. As a result, the cell containing incorrect number of chromosomes fails to function normally.

Hence, option b. is correct.

Reasons for the incorrect statement:

Option a. is given as “base-pair susbtitutions”. When a nucleotide base pair is substituted by other base, it is known as base-pair substitution...

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