Final answer:
The genotypes IAIA and IAi produce blood type A, with IA being the allele that encodes the A antigen, dominant over the i allele which encodes for O blood type.
Step-by-step explanation:
The genotypes that produce blood type A are IAIA (homozygous) and IAi (heterozygous). The IA allele encodes the A antigen on red blood cells, which determines blood type A. Since both A and B alleles are dominant over the O allele, an individual with the IAIA genotype has type A blood from receiving an A allele from each parent, whereas an individual with the IAi genotype also has type A blood from receiving one A allele (dominant) and one O allele (recessive).