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Blood Types. Human ABO blood types are determined by alleles IA, IB, and i. IA and IB are codominant. i is recessive. PhenotypeGenotypeA IA IA , IA iB IB IB , IB iAB IA IB O ii. Antigens and Antibodies. Agglutinogens (Antigens) proteins on the surface of red blood cells
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