The gene for color blindness (color blindness) is located on the X chromosome. Determine the likelihood

The gene for color blindness (color blindness) is located on the X chromosome. Determine the likelihood of having children with color blindness in a family where the wife has normal vision, but her father was color blind. There is no color blindness in the husband’s family.

The recessive gene for color blindness is linked to the X chromosome. A woman gets one X chromosome from her father and the other from her mother. A man has one X chromosome.

If a woman sees normally, but her father was color blind, then she is a carrier of this gene.

Let A be the norm, then a is color blindness.

РР f ХАХа (н) х m ХАУ (н)

m / f   ХА У ХА ХАХА(н) ХАУ(н) Ха ХАХа(н) ХаУ(д)
By phenotype:

75% – children will have normal color perception;

25% – children can be color blind, and it will only be boys.

Answer: 25%.