JAMB - Biology (2022 - No. 23)
When a colour blind woman marries a normal man, what is the probability of their son being colour blind?
25%
100%
50%
0%
Forklaring
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