Remember, in any diploid organism, such as humans, every single chromosome comes with a homologous pair. So in this particular case, we have this chromosome, number one, and this is the homologous chromosome to this chromosome, number one. And because they're homologous, what that means is they carry similar genes that code for the same exact trait or traits. And in this particular case, we have three different traits. So we have allele number one shown in red, and allele number two, also shown in red. And it's the pair of alleles found at this particular locus.