Question

A man with blood group 'A' marries a woman with blood group 'B'. What are all the possible blood groups of their offsprings?

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

Answer 1

The correct option is A A,B, AB and O

• A man with blood group A has an antigen on its RBC encoded by gene I${}^A$ and antibody for B.
• Similarly, a woman with blood group B has B antigen on its RBC encoded by gene I${}^B$ and antibody for A.
• A man with blood group 'A' marries a woman with blood group 'B', the possible blood groups of their offspring can be A, B, AB, and O because they have both antigen A and B and antibodies for both A and B.
  

So, the correct answer is option A.