Codominance and multiple alleles are examples found in the human blood group system. Iᵃ, Iᵇ, and I⁰ alleles control the human. Iᵃ produces antigen A, Iᵇ produces antigen B and I⁰ does not produce and surface antigen. IᵃIᵇ produces antigen AB. Out of the 3 allele Iᵃ and Iᵇ are dominant alleles.
The four main blood types (groups) are A, B, AB, and O. The genes you inherited from your parents determine your blood type.
Blood group O - has no antigens, but both anti-A and anti-B antibodies in the plasma Blood group AB - has both A and B antigens, but no antibodies Blood group A - has A antigens on the red blood cells with anti-B antibodies in the plasma Blood group B - has B antigens with anti-A antibodies in the plasma
Hence, ABO blood group is example of co dominance and multiple alleles.
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