What is the chance that the male offspring will have the disability?

A female who is a carrier of an X-linked recessive disability produces an offspring with a normal male.

What is the chance that the male offspring will have the disability?
A . 0%
B . 25%
C . 50%
D . 100%

View Answer

Answer: C

Explanation:

The situation presented is an Xx (female) crossed with an XY (male). Because the offspring is a male (XY), the X-chromosome must come from the mother. Consequently, there is a 50% chance of receiving the recessive x-chromosome.