Affected individuals with an autosomal dominant trait can be represented by which genotype?

In the context of autosomal dominant traits, the phenotypic expression occurs even if only one copy of the dominant allele is present. This means both homozygous dominant (AA) and heterozygous (Aa) individuals will exhibit the trait.

Individuals with the genotype AA have two copies of the dominant allele and will express the trait fully. Those with the genotype Aa, having one dominant allele and one recessive allele, will also display the trait due to the presence of the dominant allele. Therefore, the correct response acknowledges that both genotypes (AA and Aa) can result in an individual showing the autosomal dominant trait.

The recessive genotype (aa) does not exhibit the dominant trait, hence it is not included as a representation of affected individuals in the context of autosomal dominance.