Question

What will be the parent's blood groups if the blood group of a child is AB?

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

Answer 1

The correct option is D A, B and AB.

• In ABO blood group system, the classification of human blood is based on the presence or absence of the antigens A and B on the surface of the red cells. An individual may have type A, type B, type O or type AB blood.
• If a child is having blood group AB (i${}^A$ i${}^B$), then parents' blood will be A (i${}^A$ i${}^A$) and AB (i${}^A$ i${}^B$) out of the given options.
• This is because the rest options are having blood group O (i${}^O$ i${}^O$) which is incorrect as a child is not having i${}^O$ gene.
  

Thus, the correct answer is option D.