Question

Human blood type is determined by codominant alleles. There are three different alleles, known as $I^A$, $I^B$, and i. The $I^A$ and $I^B$ alleles are co-dominant, and the i allele is recessive.
The possible human phenotypes for blood group are type A, type B, type AB, and type O. Type A and B individuals can be either homozygous ($I^A{I}^A$ or $I^B{I}^B$, respectively), or heterozygous ($I^{A}i$ or $I^{B}i$, respectively).
A woman with type A blood and a man with type B blood could potentially have offspring with which of the following blood types?

• A. Type A
• B. Type B
• C. Type AB
• D. All of the above

Answer 1

The correct option is D All of the above

A woman with type A blood and a man with type B blood could potentially have offspring with either type A or B or AB blood. The mother with blood group A and the father with blood group B can have different phenotypes as given in the table. When we cross the different combinations, we can see that all the genotypes like I${}^A$I${}^B$, I${}^A$i, I${}^B$i, ii can be produced which correspond to the blood types AB, A, B, and O respectively. Hence, the correct answer is the option D.