What genotype indicates that Ami cannot have B blood type?

The question is asking which genotype indicates that Ami cannot have B blood type. To determine this, it's important to consider the genetics of blood type. Blood types are determined by alleles: type A can be represented by either AA or AO, type B by either BB or BO, type AB by AB, and type O by OO.

If Ami’s genotype is AA, she can only pass on an A allele, and thus can either have blood type A or blood type AB if paired with another individual with a compatible allele. For genotype AO, Ami can pass on either an A or an O allele. In this case, she may also express blood type A or type O. Neither of these genotypes (AA or AO) would allow for any B alleles, meaning Ami cannot express blood type B if her genotype is one of these.

The correct answer is that neither AA nor AO would yield a B blood type, affirming that Ami cannot be B blood type with those genotypes. The clarity here lies in recognizing the absence of any B alleles in these genotypes, firmly establishing that the question is correctly approached with the understanding that both AA and AO genotypes prevent the expression of B blood type.