Question

A woman had normal vision, but her father was colourblind. She marries a man, who is colourblind.
Find out the probability of the first child being colourblind, whether it is a boy or girl.

Answer 1

That woman is heterozygous, and carrier of that trait because her father was colourblind. She marries a colourblind man, then it might be possible that her first child will be colourblind whether a son or a daughter because mother and father both possess an inherited chromosome.