When a colour blind woman marries a normal man, what is the probability of their son being colour blind?
A.
25%
B.
100%
C.
50%
D.
0%
Correct answer is B
If a woman is colorblind, that means she has the nonworking gene on both X chromosomes.
Since sons almost always get their only X chromosome from their mom, chances are they will be colorblind too.
