Human blood has four phenotypes, a, B, AB, and O. The jeans for ANB are dominant, won’t as recessive. If a person has ab blood type, what inheritance pattern is demonstrated?

Answer 1

If a person has AB blood type, it demonstrates a codominance inheritance pattern. In this case, both the A and B alleles are expressed equally in the phenotype. The A and B alleles are both dominant over the O allele (which is recessive), and since both A and B phenotypes are present in the AB blood type, they are considered to be codominant.