Question

What can be the blood group of offspring when both parents have $AB$ blood group ?

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

Answer 1

Answer: (B)

When both parents have blood group $AB(I^A{I}^B)$ then offsprings can have blood groups $A(I^A{I}^A)$, $B(I^B{I}^B)$ or $AB(I^A{I}^B)$ but not $O$ as allele $i$ is not present in any of the parents.