In the ABO blood groups in humans, A) I^A,I^B,and I^O are codominant. B) I^A,I^B,and I^O are incompletely dominant. C) I^A and I^B are codominant and are dominant to I^O. D) I^O is incompletely dominant to I^A and I^B. E) I^A is dominant to I^B and I^B is dominant to I^O.

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In the ABO blood groups, I^A and I^B are both codominant and are both dominant to I^O. This means that if an individual has one allele for A blood type (I^A) and one allele for B blood type (I^B), they will have AB blood type. However, if they have one allele for O blood type (I^O) and one allele for either A or B blood type, they will have A or B blood type because the A and B alleles are dominant.

In the ABO Blood Groups in Humans