A recessive X-linked gene mutation is known to generate premature baldness in males but is without effect in women.If a heterozygous female marries an affected male,what proportion of all their children is expected to be prematurely bald?
A)1/4
B)1/8
C)1/16
D)1/32
E)1/216

Question

Quizplus · Accepted Answer

Since the gene for premature baldness is X-linked and recessive, a heterozygous female (XBXb) married to an affected male (XbY) can produce children with the following genotypes: XBXb (normal female), XBY (normal male), XbXb (bald female), and XbY (bald male). Therefore, 1/4 of all their children are expected to be prematurely bald (XbY males).

A Recessive X-Linked Gene Mutation Is Known to Generate Premature