The right option is; D. An allele is one version of a gene
Genes are unit of hereditary, and a segment of deoxyribonucleic acid (DNA) that carries genetic information which is transferred from a parent to offspring. Every individual possess two copies of each gene that are inherited from each parent. Alleles are alternative forms or version of a gene that has little differences in their sequence of DNA bases. These small differences are responsible for every individual’s unique physical traits.
