Question

A woman with normal vision marries a man with normal vision. They have a colourblind son. Her husband dies and she marries a colourblind man. Show the type of children that might be expected from this marriage and the proportion of each.

Answer 1

In the first marriage of woman the son was colourblind therefore the woman is a carrier genotype of that Woman: XX

Since the man in the second marriage was colourblind.

Genotype of that man: XY

Possible combination of this marriage.