Question

If a girl is color blind, what is the possibility that her father is also color blind?

Answer 1

1. When a girl inherits a pair of affected X chromosomes, she can become colorblind. Only if the father is colorblind and the mother is at least carrier can a girl be born colorblind.
2. As a result, if the maternal grandfather is colorblind, the mother will be a carrier of the disease at the very least.