Human blood types have 3 alleles: A, B, and O. A and B are codominant, while o is
recessive to A and B.
If a person has the genotype AO what is their blood type?
a. O
b. B
C. AB
d. A
A genotype of AO means that the person only has the A antigen, so their blood type is just A. AO and AA have different genotypes but the same blood type.
