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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%.
How genetic conditions are inherited. Each cell in the body contains 23 pairs of chromosomes. One chromosome from each pair is inherited from your mother and one is inherited from your father. The chromosomes contain the genes you inherit from your parents.There may be different forms of the same gene â called alleles. For example, for the gene that determines eye colour, you may inherit a brown allele from your mother and a blue allele from your father.he chromosomes contain the genes you inherit from your parents. There may be different forms of the same gene â called alleles. For example, for the gene that determines eye colour, you may inherit a brown allele from your mother and a blue allele from your father.