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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 10SQ
Textbook Problem
174 views

Crossing over mixes up ______.

  1. a. chromosomes
  2. b. alleles
  3. c. zygotes
  4. d. gametes

Summary Introduction

Introduction: During the prophase I phase in meiotic division, the chromosomes condense together and the chromosomes come closer to their homologous pair in order to align with their respective chromatids. This process helps in the formation of crossing over where there will be an exchange of DNA segments between the homologues chromosomes. Crossing over is essential for the meiotic process.

Explanation of Solution

Reason for correct answer:

The crossing over involves the exchange of the DNA segments between the homologues chromosomes. Due to this exchange of DNA segments, there will be a change or alteration in the alleles that are present between the homologues chromosomes. Thus, the chromosomes help to produce the gametes possessing new order of alleles.

Option b. is given as “alleles”.

In the crossing over, the exchange of DNA segments between the homologues chromosomes involves the formation of new orders of alleles.

Hence, the correct answer is option b.

Reason for incorrect answer:

Option a...

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