f someone has blood type A, they must have at least one copy of the A allele, else they could have two copies. So, their genotype is either AA or AO. Similarly, someone who is blood type B could have a genotype of either BB or BO. A blood test of either type AB or type O is more informative. Someone with blood type AB must have both the A and B alleles. The genotype must be AB. Someone with blood type O has neither the A nor the B allele.
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DNA & Genetics
DNA & Paternity
