In humans, blood types A and B are codominant to each other and each is dominant to O. What blood types are possible among the offspring of a couple of blood types AB and A?
A) A, B, AB, and O
B) A, B, and AB only
C) A and B only
D) A, B, and O only
E) A and AB only

Question

Quizplus · Accepted Answer

The AB parent can pass on either an A or B allele, while the A parent can pass on either an A or O allele. The possible combinations are AA, AO, AB, and BO, resulting in blood types A, B, and AB.

In Humans, Blood Types a and B Are Codominant to Each