Question

Assertion: In a person with an AB blood group, the erythrocytes carry both A and B antigens on their surface.
Reason: The alleles $I^A$ and $I^B$ produce AB blood group are co-dominant and both are expressed.

• A. Both assertion and reason are true and the reason is a correct explanation of the assertion
• B. Both assertion and reason are true but the reason is not a correct explanation of the assertion
• C. Assertion is true but the reason is false
• D. Both assertion and reason are false

Answer 1

The correct option is A Both assertion and reason are true and the reason is a correct explanation of the assertion

The assertion is true and the reason is the correct explanation of the assertion because the blood group antigens are present at the surface of the RBCs and both the antigens A and B are produced by codominant alleles. The diagram below represents the blood group antigens on the surface of RBCs and their corresponding blood groups.