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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 12, Problem 2SQ
Textbook Problem
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Meiosis is a necessary part of sexual reproduction because it __________.

  1. a. divides two nuclei into four new nuclei
  2. b. reduces the chromosome number for gametes
  3. c. gives rise to new alleles

Summary Introduction

Introduction: Cell division is the process where cells divide to produce two or more daughter cells. There are mainly two types of cell division, namely mitosis and meiosis. Mitosis involves the division of a single cell into two identical daughter cells. Meiotic division is a type of division that occurs in a cell that typically lessens the number of chromosomes present in its parent cell by half. A diploid parent cell (2n) is used for the production of four haploid (n) daughter cells. Meiotic division mainly occurs in the reproductive cells (egg and sperm). When the haploid sex cells fuse together to form a distinct cell, it restores the diploid condition of the cell (zygote). There are two phases of meiosis – meiosis I and meiosis II.

Explanation of Solution

Reason for correct answer:

Nuclear division in sexual reproduction, called meiosis, is a reduction process which involves the division of a single cell (twice) to produce four daughter cells which contain exactly half the original chromosomes. In anaphase I, the homologues chromosomes are pulled to opposite poles of the cell. Thus, there will be a reduction in the chromosome number of the cell. Meiotic division produces the gametes which are haploid reproductive cells. During sexual reproduction, these haploid gametes – the male gamete and female gamete fuse with each other by the fertilization process to form the zygote, which is a diploid cell. Thus, meiosis can halve the number of chromosomes that are then restored by the fertilization process.

Option b. is given as “reduces the chromosome number for gametes”.

Meiotic division is a type of division that occurs in a cell that typically lessens the number of chromosomes present in its parent cell by half...

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