Genetics of Blood Type

Abstract
There are four known blood types in humans: A, B, AB and O. Blood phenotypes are produced as a result of combination of the three alleles: A, B, and O. Alleles A and B are co-dominant and allele O is recessive. Therefore, a person with genotype AO or AA will have blood type A. Similarly, in a person with genotype BO or BB, the blood type will be B. If a person has genotype AB, the blood type is AB. For a person to have blood type O, the genotype must be OO. 

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