Sex-Linked Inheritance Problem Set

Problem 6: Hemophilia in humans

Hemophilia in humans is due to an X-chromosome mutation. What will be the results of mating between a normal (non-carrier) female and a hemophilac male?

A. half of daughters are normal and half of sons are hemophilic.
B. all sons are normal and all daughters are carriers.
Daughters inherit a normal allele from their mother and the hemophilia allele from their father. Sons inherit the normal allele from their mother.
C. half of sons are normal and half are hemophilic; all daughters are carriers.
D. all daughters are normal and all sons are carriers.
E. half of daughters are hemophilic and half of daughters are carriers; all sons are normal.

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