Final answer:
Alleles represent different versions of a gene and determine specific traits. In the context of hair color, the different alleles of the hair color gene determine the hair color of an individual.
Step-by-step explanation:
Alleles represent different versions of a gene. In the context of hair color, the gene is responsible for determining the trait of hair color, and the different alleles of that gene determine which hair color an individual has. For example, the allele for brown hair color would result in an individual having brown hair.