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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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BuyFindarrow_forward

Biology: The Unity and Diversity o...

15th Edition
Cecie Starr + 3 others
Publisher: Cengage Learning
ISBN: 9781337408332
Chapter 13, Problem 9SQ
Textbook Problem
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The probability of a crossover occurring between two genes on the same chromosome ________.

  1. a. is unrelated to the distance between them
  2. b. decreases with increasing distance between them
  3. c. Increases with the distance between them

Summary Introduction

Concept introduction: Crossing over occurs between the homologous chromosomes during which the genes are exchanged. Crossing over occurs during the meiosis I. Crossing over helps to eliminate lethal alleles or occurrence of the homozygous recessive alleles that cause disorders. Chiasma is the point of physical contact that occurs between two homologous chromosomes during the crossing over.

Explanation of Solution

Reason for the correct answer:

For genes to undergo the cross over the thumb rule is that there must be enough distance between their loci, then the genes can be exchanged between the homologous chromosomes. Adjacent genes cannot undergo the cross over as the chiasma cannot form between the adjacent genes of the homologous chromosome. If two genes are far off, the chiasma can form between them and thus cross over can take place. If genes have a large distance between them the chiasma formation is easy to occur.

Option c. is given as “increases with the distance between them” and since a minimum distance is required between the genes for chiasma to form and greater the distance and the easier it is to form the chiasma, the correct answer is option c...

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