Understanding Dominant and Recessive Traits

Gene expression is the process by which information from a gene is used to synthesize a functional gene product, usually a protein. Genes are segments of DNA that code for specific traits in an organism. The understanding of how these genes are inherited and expressed is fundamental in genetics.

Consider a simple genetic scenario involving a single trait determined by a pair of alleles. In this case, one allele (A) is dominant over another allele (a). The different possible genotypes in this scenario include homozygous dominant (AA), heterozygous (Aa), and homozygous recessive (aa).

Based on this understanding, which of the following genotypes would result in the expression of the dominant trait?