ABO blood groups in humans are controlled by the gene I. It has three alleles – I^A, I^B and i. Since there are three different alleles, six different genotypes are possible. How many phenotypes can occur?

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Four. The ABO system has four phenotypes because I^A and I^B are codominant with each other, and both are dominant over i. That gives A, B, AB, and O as the observable blood groups.

ABO blood groups in humans are controlled by the gene I. It has three alleles – I^A, I^B and i. Since there are three different alleles, six different genotypes are possible. How many phenotypes can occur?

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