Number two, lack of pigment in the eyes. And number three, lack of pigment in the skin. These three different types of phenotype traits are expressed as a result of a single locus. 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.