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Blood Type Genetic Basis: In genetics, blood type gene has two alleles, each allele has genotype A, B or O. The A and B are dominant, and O is recessive.So allele A combined with allele O is type A. Similarly, BO is type B, AA is type A, BB is type B, OO is type O, and AB is type AB.f both parents have type A blood, then the alleles could be AA or AO, thus the allele A frequency is 75%, allele O frequency is 25% for both parents. So the chance of alleles OO is 25% Ã 25% = 6.25%, alleles AA is 75% Ã 75% = 56.25%, alleles AO is 75% Ã 25% = 18.75%, alleles OA is 25% Ã 75% = 18.75%.
ABO Blood Types. 1  Type A: The genotype is either AA or AO. The antigens on the blood cell are A and the antibodies in the blood plasma are B. 2  Type B: The genotype is either BB or BO. The antigens on the blood cell are B and the antibodies in the blood plasma are A. 3  Type AB: The genotype is AB.