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With respect to the ABO group, there are four major blood types because this blood group is determined by

1. three alleles, all of which are recessive.
2. three alleles, of which, two are recessive and the third is dominant.
3. three alleles, of which two are co-dominant and the third is recessive.
4. three alleles, all of which are co-dominant.

Correct answer: three alleles, of which two are co-dominant and the third is recessive.

Solution

The ABO blood group is controlled by three alleles: IA, IB, and i. IA and IB are co-dominant, so together they produce type AB, while i is recessive, producing type O only when paired with another i.

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