After reading the paragraph below, answer the questions that follow.
A man and his wife are having trouble having a baby. Using modern technologies, the woman's eggs are removed, fertilized with her husband's sperm, and implanted into her uterus. The procedure is successful, and the woman gives birth to a healthy baby boy. After a while, though, they discover that their son is colorblind and has blood type O. The woman claims that the child can't be theirs since she has blood type A and her husband has type B. Also, neither parent is colorblind, although one grandparent (the woman's father) is also colorblind.
In regard to the baby's colorblindness, a sex-linked recessive trait, you explain that
◦ the baby's father must have a recessive allele for colorblindness.
◦ colorblindness often appears randomly, even if neither parent is colorblind.
◦ since colorblindness is sex-linked, a son can inherit colorblindness if his mother has the recessive colorblindness allele.
◦ the eggs must have been accidentally switched, since males inherit sex-linked traits only from their fathers.
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