When a colour blind woman marries a normal man, what is the probability of their son being colour blind?
- 25%
-
100%
- 50%
- 0%
The correct answer is: B
Explanation
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
There is an explanation video available .