Question

A child with blood group ‘O’ cannot have either parents of the blood group:

• A. A and B
• B. B and O
• C. A and O
• D. AB

Answer 1

The correct option is D AB

The child's blood group is ‘O’ which means there is no antigen A or B on the RBC surface. The child has to inherit the allele for O group from both its parents. Hence, all the above given combinations of parents are possible except AB, because AB individuals always contribute either A or B antigen to the offspring.