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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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Section
BuyFindarrow_forward

Biology: The Unity and Diversity o...

15th Edition
Cecie Starr + 3 others
Publisher: Cengage Learning
ISBN: 9781337408332
Chapter 12, Problem 1CT
Textbook Problem
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The diploid chromosome number for the body cells of a frog is 26. What would that number be after three generations if meiosis did not occur before gamete formation?

Summary Introduction

To determine: The chromosome number of a frog after three generations, in case meiosis does not take place before gamete formation.

Concept 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 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

The chromosome number of a frog after three generations, if meiosis did not occur before gamete formation, will be 26. This is because meiosis is a reduction process which involves the division of a single cell (twice) to produce four daughter cells that contain exactly half the original chromosomes.  Thereby, it reduces the diploid chromosome number (2n) present in the body cells of the frog into 13...

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