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The three alleles in ABO blood groups in humans can produce six different genotypes and four different phenotypes.

1. IAIA, IAi: Blood group A
2. IBIB, IBi: Blood group B
3. IAIB: Blood group AB
4. ii: Blood group O

Correct answer: IAIA, IAi: Blood group A

Solution

The A blood group appears when at least one IA allele is present and no IB allele is present. Both IAIA and IAi produce the A phenotype because IA is dominant over i.

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