While volunteering at a hospital, Alex learns that there are several different human blood types and they are determined by alleles. For example, a person with an allele for type A blood and an allele for type B blood will have type AB blood. Alex asks a nurse if blood type A or B is dominant. What answer does the nurse give him?

There are 3 different alleles: IA, IB and i - IA and IB are codominants, i is recessive. Codominance means neither allele can mask the expression of the other and both alleles A and B are expressed in the blood type.

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Histrionicus Histrionicus · Answer 2 · 2021-09-04T09:11:49+02:00

Blood type A and Blood type B both are dominant if allele A or allele B present with the O allele, however, they show codominance if they present together.

The human blood group system is known as the ABO blood group system that exhibits codominance. Following are the characteristics of this blood group system:

The system consists of three alleles A, B, and O.
Both A and B are dominant in relation to O, and therefore blood group A or B can have the genotype AA or AO or BB or BO respectively.
If both A and B are present together then they show codominance and have the genotype AB.

Thus, the correct answer would be - both A and B are dominant if allele A or allele B present with the O allele, however, they show codominance if they present together.

Learn more about the ABO blood group system:

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