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10 (e) Blood type p112


Human blood type is controlled by a gene with multiple alleles. There are four main blood types—A, B, AB, and O. Three alleles control the inheritance of blood types. The allele for blood type A and the allele for blood type B are codominant.  Recall that when two codominant alleles are inherited, neither allele is masked.  Notice that only people who inherit two i alleles have type O blood.