Question

The blood group of Sam’s father is A+ and that of his mother is B+. However, Sam’s blood group is AB+. What is the correct explanation for this?

Answer 1

He got the A from his father and the B from his mother
the + is positive or negative Rh factor. could have gotten that from either parent

Answer 2

Step-by-step explanation:

AB blood group system in humans is determined gene I. This gene has two alleles IA IB. In heterozygous condition, both these alleles both the alleles express completely resulting in a new phenotype. This is called co-dominance and because in this both the alleles are expressed. Thus, in the given question, Sam is with blood group AB⁺ is due to co-dominance because both the alleles A⁺ and B⁺ are codominant with each other.