How are the terms gene, locus, and allele related

An allele is a variant of a gene. Each cell has two alleles (one per parent) for each gene: one dominant, one recessive. ... Locus is to some extent interchangeable with gene, though locus is less specific and doesn't imply that the location codes for an entire gene

where is the option.let me know

it takes hundreds of years to become stable.

if you have another question lmk.