In humans, ABO is regulated by three alleles known as IA, IB, and IO. Here I refer to isohemagglutinin. IA and IB are codominant, producing antigens of Type A and Type B respectively. They are shifted to the surface of RBCs whereas the IO is recessive, producing no antigens.
Explore this topic in detail at BYJU’S.
- Blood groups
- Co-dominance and multiple alleles
- What Type of Inheritance Controls Blood Types in Humans?
- Is Blood Group Genetic?