Question

The human ABO blood type trait displays four phenotypes: A, B, AB, and O. It is controlled by a single gene which has three possible alleles: A, B, and O. The A and B alleles are codominant, and the O allele is recessive to both A and B. How many different possible genotypes exist for this gene?
GPT 3.5
There are six possible genotypes for the ABO blood type gene:

1. AA
2. AO
3. BB
4. BO
5. AB
6. OO

These genotypes result in the four phenotypes: A, B, AB, and O.

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