HUMAN HEREDITY (LL)-W/MINDTAP ACCESS
HUMAN HEREDITY (LL)-W/MINDTAP ACCESS
11th Edition
ISBN: 9781305717022
Author: Cummings
Publisher: CENGAGE L
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Chapter 7, Problem 18QP

Equalizing the Expression of X Chromosome Genes in Males and Females

Males have only one X chromosome and therefore only one copy of all genes on the X chromosome. Each gene is directly expressed, thus providing the basis of hemizygosity in males. Females have two X chromosomes, but one is always inactivated. Therefore, females, like males, have only one functional copy of all the genes on the X chromosome. Again, each gene must be directly expressed. Why, then, are females not considered hemizygous, and why are they not afflicted with sex-linked recessive diseases as often as males are?

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