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.
Answer: B
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