A mother with blood type A has a child with blood type A Giv

A mother with blood type A has a child with blood type A. 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

Solution

Answer is (A).

Because blood group O is recessive alleles where as the remaining groups are codominant hence even a single copy is sufficient for their expression.

So except A all are not possible.