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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%.
The offspring will have type AB blood. However, both A&B are dominant over type O. Therefore, a person with type A blood could have the genotype of either homozygous dominant (AA-both alleles are the same and are dominant) or heterozygous (mixed alleles, one dominant, one recessive or AO).The same is true of a person with type B blood.ou can have No proteins = blood type O One type of proteins = blood type A A different type of proteins = blood type B Both types of proteins = blood type AB To get blood type AB, a person needs to get an A protein from one parent and a B protein from the other.