A mother with blood type B has a child with blood type O. Give all possible blood types for the father of this child.
A) O
B) B, AB
C) A, AB
D) A, B, O
E) A, B, AB, O

Question

Quizplus · Accepted Answer

The child with blood type O must inherit an O allele from both parents. The mother with blood type B can have genotype BO or BB, but since the child is type O, the mother must be BO. Therefore, the father must have at least one O allele, so his blood type could be A (AO), B (BO), or O (OO).

A Mother with Blood Type B Has a Child with Blood