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

For the ABO system of blood groups, allele I^AproducesN acetylgalactosamyl transferaseenzyme which recognizes H antigen present in RBC membrane and addsN-acetylgalactosamineto sugar part of H antigen to form A antigen. The allele I^B producesgalactosyl transferaseenzyme which addsgalactoseo the sugar part of H antigen to form B antigen. Allele 'i' does not produce any sugar or antigen. When both I^A and I^Bare present in a person, both enzymes thus both antigens A and B are produced. This is because of co-dominance. These antigens determine the type of AB blood group.