Changes

The '''Locus''' is the place on a [[chromosome]] where a specific [[gene]] is located, a kind of address for the gene. The plural is "loci," not "locuses."  

The '''locus''' is the place on a [[chromosome]] where a specific [[gene]] is located, a kind of address for the gene. The plural is "loci," not "locuses."  

Put another way, a locus is any site that has been defined genetically. It may be a gene, or a part of a gene, or a [[DNA]] sequence that plays a regulatory role.  A locus may be occupied by different sequence forms or [[alleles]].

Put another way, a locus is any site that has been defined genetically. It may be a gene, or a part of a gene, or a [[DNA]] sequence that plays a regulatory role.  A locus may be occupied by different sequence forms or [[alleles]].