What type of genetic makeup would you suspect in an organism that expresses a dominant trait?

The presence of a dominant trait in an organism suggests that the organism carries at least one dominant allele for that trait. This genetic setup can occur in two configurations: homozygous or heterozygous.

In a homozygous condition, the organism possesses two identical alleles for that trait, either both being dominant (e.g., AA) or both recessive (e.g., aa). However, since we are discussing a dominant trait, the homozygous arrangement related to the dominant trait would be specifically the AA condition.

On the other hand, in a heterozygous condition, the organism carries one dominant allele and one recessive allele (e.g., Aa). The presence of the dominant allele is sufficient for the organism to express the dominant trait despite the presence of the recessive allele.

Since both homozygous dominant (AA) and heterozygous (Aa) configurations can result in the manifestation of a dominant trait, the genetic makeup can indeed be either heterozygous or homozygous. Therefore, the correct choice aligns with this understanding.

The other options imply a more restricted view of the genotype possibilities, which does not account for the full range of genetic variation that can lead to the expression of a dominant trait