Answer:
"Alleles are alternate versions of the same gene(s) that have small differences in their nucleotide sequences."
The correct answer is D.
Explanation:
Alleles are responsible for everyone's unique features.
An allele can be defined as the two or more different forms of a gene that can be found in the same specific place of a specific chromosome (this means that each allele has a locus).
The existence of different alleles for a specific gene is a product of mutation.
