What does the term "homozygous dominant" indicate about an organism’s alleles?

The term "homozygous dominant" refers to an organism that has two identical alleles for a specific trait, both of which are dominant. This means that the organism carries two copies of the dominant allele, which will typically be expressed in the organism's phenotype, resulting in the dominant trait being observed. For example, if the dominant allele for flower color is purple (P), a homozygous dominant organism would have the genotype PP, leading to the production of purple flowers.

In contrast, the other options reflect different allele combinations. An organism with both recessive alleles represents a homozygous recessive condition, while having one dominant and one recessive allele indicates a heterozygous condition. The term “neutral” does not apply in the context of alleles, as alleles are classified based on their ability to express traits. Thus, the definition of "homozygous dominant" primarily highlights the presence of two dominant alleles, confirming the correctness of this choice.