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The answer is 3

A, B, and O.

The four main blood groups A, B, AB, and O are controlled by three alleles: A, B, and O.

What are the alleles for blood type A?

Human blood type is determined by codominant alleles. There are three different alleles, known as IA, IB, and i.

What 3 alleles are involved in blood typing?

The human ABO blood group system exhibits codominance. The system consists of three alleles A, B, and O.

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