Sex-Linked Inheritance Problem Set

Problem 10: Offspring of human females who are carriers for X-linked traits

A human female "carrier" who is heterozygous for the recessive, sex-linked trait red color blindness, marries a normal male.

What proportion of their female progeny will show the trait?

A. All

B. 1/2

C. 1/4

D. 0

Half the sons would be expected to inherit the color blindness allele from their mother. Half the daughters would be carriers like their mothers.

E. 3/4

The Biology Project
University of Arizona
Updated: July 15, 1999
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