Essential Cell Biology
Essential Cell Biology
4th Edition
ISBN: 9780815344544
Author: Keith Roberts, Karen Hopkin, Alexander D Johnson, Martin Raff, Dennis Bray, Bruce Alberts, Julian Lewis, Peter Walter
Publisher: TAYLOR
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Chapter 5, Problem 4Q
Summary Introduction

To explain: The reason for a man with mutation in his X chromosome having color blindness, whereas a woman with the same problem has no color blindness.

Introduction: For every man, there are one X and one Y as their sex chromosomes (XY), whereas every woman carries two X (XX) chromosomes. Since men have no backup copy, any mutations in either X or Y would be carried to the further generations. But for women, any mutations associated with any of the two X chromosomes will be compensated by the normal copy. This could be used to explain variations in color blindness in men and women.

Summary Introduction

To explain: If a woman is color blind, what would be her father.

Introduction: For every man, there are one X and one Y as their sex chromosomes (XY), whereas every woman carries two X (XX) chromosomes. Since men have no backup copy, any mutations in either X or Y would be carried to the further generations. But for women, any mutations associated with any of the two X chromosomes will be compensated by the normal copy. This could be used to explain variations in color blindness in men and women.

Summary Introduction

To explain: If a woman is color blind, what would be her mother.

Introduction: For every man, there are one X and one Y as their sex chromosomes (XY), whereas every woman carries two X (XX) chromosomes. Since men have no backup copy, any mutations in either X or Y would be carried to the further generations. But for women, any mutations associated with any of the two X chromosomes will be compensated by the normal copy. This could be used to explain variations in color blindness in men and women.

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