A Man and His Wife Are Having Trouble Having a Baby

question 29

Multiple Choice

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.
-As a genetic counselor, you would explain to the parents that

• A) the eggs must have been accidentally switched, since the baby's blood type has to match one of his parents.
• B) each parent could have contributed one recessive allele, resulting in type O blood.
• C) the eggs must have been accidentally switched, since a type A parent and a type B parent can have any type children except O.
• D) it is possible for the baby to have type O blood, since type O is inherited through a dominant allele.

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