Which Alleles are Dominant to Each Other in Blood Type

Question

Which alleles are dominant to each other in blood type inheritance?
A) Alleles IA and i are dominant to the allele IB.
B) Alleles IB and i are dominant to the allele IA.
C) Alleles IA and IB are dominant to the allele i.
D) Alleles IA, IB, and i are codominant.

Accepted Answer

Alleles IA and IB are codominant and dominant to the recessive allele i, meaning they express themselves equally when present together. However, when both IA and IB are present in an individual, they both contribute to the phenotype resulting in AB blood type.