Which phenotype corresponds to a child with the genotype AO?

The phenotype that corresponds to a child with the genotype AO is Type A. This is because blood type is determined by the presence of specific antigens on the surface of red blood cells. The A and B alleles are co-dominant, meaning that when both are present, they produce Type AB blood. However, when the A allele is paired with the O allele, as in the case of the AO genotype, the A allele dominates.

In this scenario, the O allele does not produce any antigens, so it does not affect the expression of the A allele. Therefore, the presence of at least one A allele results in the phenotype associated with Type A blood. Understanding how the genotypes interact to express specific blood types is crucial for determining blood compatibility and for studying inheritance patterns.