What kind of vision offspring can be expected from normal men and women on this basis if their fathers were color blind?

Let the chromosome containing the gene for the development of color blindness be denoted Xd, and the chromosome with the gene that causes the development of normal color vision be denoted XD.

A man with normal color vision will be designated XD Y. This healthy man produces two types of sperm, XD and Y. His father’s color blindness does not matter, since he inherits a chromosome from his father that does not contain information about color vision (Y).

The woman’s father was color blind – Xd Y. He passed on to his daughter only a chromosome with a pathological gene – Xd.

Consequently, a woman is a carrier of the gene for color blindness, she is heterozygous – XDXd, and produces two types of eggs – XD and Xd.

The offspring of this married couple will be represented by the following possible options:

girls who do not suffer from color blindness, but are carriers of the pathological gene (XDXd) – 25%;

girls who do not suffer from color blindness and are not carriers of the gene for color blindness (XDXD) – 25%;

boys with normal color vision (XD Y) – 25%;

color blind boys (Xd Y) – 25%.