In genetics, the term locus refers to the _ of the gene on the chromosome.

Explanation

Factual recall; The locus describes the position of the gene on a chromosome, so option A is correct.Option B, frequency, is generally used to describe frequency of alleles, i.e. how frequently one allele occurs relative to the other or the proportions in which each allele of a particular gene occurs.Option C, copy, as the name implies, refers to copies or duplications of a portion of the genetic code, found in the genome of an organism.Option D, inversion, is a mutation, that involves chromosome rearrangement, where one segment of a chromosome is reversed from end to end.