It codes for a protein that is used to express the height of that particular plant. Now, in the same exact way that when I tell somebody my dress, they know exactly where to live and where to find me when I tell somebody the locus of any given gene, the locus basically refers to where that gene is found along that DNA, along that chromosome. So a locus refers to the location on that chromosome for that specific gene that codes for some specific trait. So a locus is not the same thing as a gene. So a locus basically tells us the dress of that given gene. So on the following chromosome, we have many different loci.