Which of the following describes heterozygous dominant?

The term "heterozygous dominant" refers to the genetic condition where an individual has two different alleles for a particular gene, one being dominant and the other being recessive. In this case, "Aa" represents the combination of alleles where "A" is the dominant allele and "a" is the recessive allele.

In genetics, when an organism has one dominant allele and one recessive allele for a gene, the dominant allele will typically determine the phenotype, or observable traits, of the organism. This is distinct from being homozygous, where both alleles are the same (either both dominant, "AA," or both recessive, "aa"). Therefore, "Aa" accurately describes a heterozygous condition that is also dominant because the presence of one dominant allele is enough to express the dominant trait.

The other options do not correctly describe heterozygous dominant. "AA" indicates a homozygous dominant condition, where both alleles are dominant, while "aa" reflects a homozygous recessive condition with two recessive alleles. The last option, "A," does not provide enough information as it only represents one allele rather than a full genotype.