Here's a breakdown:
* Locus: A specific location on a chromosome where a gene resides.
* Alleles: Different versions of a gene at a specific locus.
* Trait: A characteristic or feature of an organism, often influenced by multiple genes.
For example, eye color is a trait influenced by several genes. Each of these genes has a specific locus on a chromosome, and different alleles at these loci can contribute to different eye colors.
Therefore, the DNA coding regions that affect the same trait (like eye color) are located at different loci on chromosomes, but they all contribute to the same overall phenotype.