Question

A women with blood type AB is planning to have a family with a man who is blood type O. How many different phenotypes could their children have?

A- 2
B- 1
C- 3
D- 4

Answer 1

A woman with blood type AB can pass either an A or a B allele to her child. A man with blood type O can only pass an O allele to his child. This couple could have children of either blood type A (O from father and A from mother) or blood type B (O from father and B from mother). So the answer is A- 2 different phenotypes for their children.