You can either have AB, A, B, or 0. so in general 4 groups.
But the blood groups A and B can be heterozygous or homozygous. Meaning Aa, AA or Bb, BB
Answer
The blood groups are A, B, AB and O. The blood genotypes are AA, BB, AB, AO, BO and OO. A and B are equally dominant alleles, thus explaining the existence of AB.
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