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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 12SQ
Textbook Problem
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Which phase of meiosis reduces the chromosome number?

  1. a. prophase I
  2. b. prophase II
  3. c. anaphase I
  4. d. anaphase II

Summary Introduction

Introduction: Cell division is the process where the cells divide to produce two or more daughter cells. Mitosis and Meiosis are the two types of cell division. Mitosis involves the division of a single cell into two identical daughter cells. Meiosis involves the production of the sex cells, namely sperms and eggs. This process involves the division of a single cell twice to produce four daughter cells, which exactly contains half of the original chromosomes. Meiosis I and Meiosis II are the two phases of meiosis. In meiosis I, there will be a separation of the homologous pairs through the first round of the cell division. In meiosis II, there will be separation of the sister chromatids during the second round of the cell division.

Explanation of Solution

Reason for correct answer:

Meiosis involves the division of a single cell twice to produce four daughter cells, which exactly contains half of the original chromosomes. It involves the production of the sex cells-sperms and eggs. 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.

Option c. is given as “anaphase I”.

In the anaphase I, there occurs the segregation of the homologues chromosomes in each pair and then they move towards the opposite spindle fiber poles.

Hence the correct answer is option c.

Reason for the incorrect answer:

Option a. is given as, “prophase I”.

During prophase I, chromosomes begin to condense and there occurs the breakdown of the nuclear envelope. The main event that takes place in this phase is the occurrence of crossing-over...

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