Xeroderma pigmentosum (XP) is a human disease which is autosomal recessive. It is a genetic mutation which negatively affects the body’s ability to repair thymine dimers. Without this ability to repair damage, the individual has a 1000-2000 times great chance of getting skin cancer. Suppose a woman who is a carrier for XP and marries a normal man. They have two children. One is normal and the other has XP. What is the genotype of the father?

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