Debra has type O blood. She has two children with Victor whose blood type is AB. The first daughter has type B blood and the second has type O. Which of the following phenotypes are not possible with this cross?
A. A
B. AB
C. B
D. O

B and D

Explanation:

IO is recessive allele and for the daughter to be of blood type O, her genotype should be IO IO. This is not possible since the genotype of Victor is IA IB.

The only possible genotypes are:

Crossing IO IO × IA IB,

IA IO - 50% blood type A

IB IO - 50% blood type B

true is the final answer!

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