Question

If gene for A and B blood group becomes incompletely dominant instead of co-dominant then how many blood groups are possible?

• A. 2
• B. 3
• C. 4
• D. 5

Answer 1

The correct option is C 4

Explanation –
ii - O
$I^A{I}^A,I^{A}i-A$
$I^B{I}^B,I^{B}i-B$
$I^A{I}^B$ - New blood group instead of AB blood group.
RBCs in this new blood group would have a hybrid antigen showing half properties of A antigen and half properties of B antigen instead of RBC of AB blood group which has complete A and B antigen individually.