Alleles are described as ______.homologous chromosomesalternate versions of a genealternate phenotypesenvironmental factors that affect gene expression

Alleles are described as alternate versions of a gene.

Alleles are different forms of a single gene that can exist at a specific locus on homologous chromosomes. For example, a gene that determines the color of flowers might have a purple allele and a white allele. These variations can result in different traits being expressed in the organism. While homologous chromosomes refer to the paired chromosomes with similar structure and gene sequence, alleles specifically pertain to the various forms that a particular gene may take, impacting the phenotypic expression of traits. Environmental factors can influence gene expression but do not define what alleles are.