The genes for color blindness and hemophilia are completely linked and are located on the same chromosome. A healthy woman, whose father is color blind, and whose mother is a carrier of the hemophilia gene, marries a healthy man. What is the probability of a healthy son being born in this family?
A healthy man always gives his sons the Y-chromosome, so the son gets the disease from his mother. And according to the condition of the problem, the mother is the carrier of the genes of two diseases at once, so there will never be healthy sons in this family.
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