These are known as alleles. So alleles are basically two genes that are located on homologous chromosomes that code for a similar polypeptide, a similar protein that gives us or helps us express that same type of trait. So in this particular homologous pair, we have 1234 genes on this chromosome, 1234 genes on this chromosome. So we have a total of eight genes, but we have a total of four alleles. This is one allele pair, a second allele pair. We have a third allele pair and a fourth allele pair.