An infant is born with blood type AB. The father is type A and the mother is type B. The father asks why the baby has a blood type different from that of the parents. The nurse's answer should be based on the knowledge that which is true?
a. Both A and B blood types are dominant.
b. Types A and B are recessive when linked together.
c. The baby has a mutation of the parents' blood types.
d. Type A is recessive and links more easily with type B.
ANS: A
Types A and B are equally dominant, and the baby can thus inherit one from each parent. Both types A and B are dominant, not recessive. The infant has inherited both blood types from the parents and is not a mutation. Both types A and B are equally dominant.
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