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MCAT Question A Day - 5/5/13 - Answer!

What blood type is not possible in a child produced by a Type A father and a Type B mother?

A.  A and B
B.  AB
C.  O
D.  All are possible.

The correct answer is (D). All are possible because the question does not specify the exact genotype of either parent. If the father (Type A) had the IAi genotype and the mother (Type B) had the IBi genotype, all combinations can be produced: IAi (Type A), IBi (Type B), IAIB (Type AB), and ii (Type O).

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