Question

A person with blood group A produces antibodies against B. A person with blood group B produces antibodies against A. A person with blood group AB produces no antibodies. How can you explain this?

A and B alleles are co-dominant. Therefore, both A and B carbohydrates are present on the cell.
A is incompletely dominant over B. Both A and B carbohydrates are present on the cell.
A and B alleles are co-dominant. Half the cells have only A, and other half have only B.

Answer 1

I think the correct answer from the choices listed above is option A. From the situation stated above we can say that A and B alleles are co-dominant. Therefore, both A and B carbohydrates are present on the cell. Hope this answers the question.