Question

A child with mother of blood group A and father of blood group AB will not have which of the following blood groups?

• A. A
• B. B
• C. AB
• D. O

Answer 1

The correct option is D O

Blood type is an example of a common multiple allele traits. There are 3 different alleles for blood type, (A, B, & O). A is dominant to O. B is also dominant to O. A and B are both codominants.

If mother blood group is A then she might have (IA IA) or (IA i) and father would be having (I${}^A$ I${}^B$), their cross would produce any one of the following:

I${}^A$ i x I${}^A$ I${}^B$ = I${}^A$ I${}^A$ (A Blood group), I${}^B$ i (B Blood group) or I${}^A$ I${}^B$ (AB Blood Group), therefore O blood group would not be possible. Thus, the correct answer is option D.