Zoology - Principles of Inheritance and Variation Question with Solution | TestHub

In humans, AB blood group shows codominance. Here, allele ${\mathrm{I}}^{\mathrm{A}}$ for A-type blood is codominant with allele ${\mathrm{I}}^{\mathrm{B}}$ for B-type blood. In heterozygotes, ${\mathrm{I}}^{\mathrm{A}}{\mathrm{I}}^{\mathrm{B}}$ expresses the characteristics of both A and B antigens, i.e. ${\mathrm{I}}^{\mathrm{A}}{\mathrm{I}}^{\mathrm{B}}$ possess RBCs that carry both A and B antigens at their surface.