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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 14, Problem 7SQ
Textbook Problem
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Color blindness is inherited in a(n) _______ pattern.

  1. a. autosomal dominant
  2. b. autosomal recessive
  3. c. X-linked dominant
  4. d. X-linked recessive

Summary Introduction

Introduction: Colorblindness (red-green colorblindness) is color vision deficiency, and colorblind individuals have different color perception. They have difficulty in seeing red, blue, green, or a combination of these colors. Gene expression in human body is required to form photopigments. The defects in these genes can cause colorblindness. It is a recessive X-linked condition.

Explanation of Solution

Reason for the correct statement:

The genes responsible for colorblindness are located on X chromosome. Males have one X chromosome and females have two X chromosomes. If females carry mutated gene on one of her X chromosome, she will be a carrier. Females are colorblind only if they carry mutated genes on both X chromosomes. However in other cases, if males carry mutated gene on X chromosome, they will show colorblindness.

Hence, option d. is correct.

Reasons for the incorrect statement:

Option a...

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