Biology for IGCSE & O level - Inheritance (Section 2 - No. 44)
What is the probability of a woman who is a carrier for red-green color blindness and a man with normal vision having a color-blind son?
0%
25%
50%
100%
Explanation
The woman carries the color-blindness allele on one of her X chromosomes (XcX). The man is normal (XY). Half of their sons will inherit the Xc allele and be color-blind.
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