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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 6SQ
Textbook Problem
256 views

Dogs have a diploid chromosome number or 78. How many chromosomes do their gametes have?

  1. a. 39
  2. b. 78
  3. c. 156
  4. d. 234

Summary Introduction

Introduction: Cell division is the process where the cells divide to produce two or more daughter cells. There are mainly two types of cell division- Mitosis and Meiosis. Mitosis involves the division of a single cell into two identical daughter cells. Meiotic division is a division that occurs in a cell that typically lessens the number of chromosomes present in the parent cell by half. A diploid parent cell (2n) is used for the production of four haploid (n). Meiotic division occurs mainly in the reproductive cells (egg and sperm). When the haploid sex cells fuse together to form a particular distinct cell, they restore 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:

The chromosome number present in the haploid cells of dog will be 39 because during the meiosis I process, the homologous pairs separate. So, 78 chromosomes present in the diploid cells will assemble at the equator of the cell. After that, 39 chromosomes present in the haploid cells will progress towards each of the pole of cells. Hence, there will be 39 chromosomes at each pole of the cell. The number of chromosomes will be less from diploid (2n) to haploid (n). Then the cells undergo meiosis II, where there will be division of the cells to produce the 4 haploid daughter cells having exactly half the number of chromosomes of the parent cell.

Option a. is given as “39”.

During the meiosis I process, the homologous pairs separate. The number of chromosomes will be less from diploid (2n) to haploid (n). Then it undergoes the meiosis II, where the cells divide to produce 4 haploid daughter cells which have half the number of chromosomes of the parent cell...

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