And each one of these genes codes for some type of protein or proteins that help express some type of trait. For example, let's say the purple gene codes for a protein that expresses the height of that organism. We can say the green gene creates a protein or codes for protein that expresses the color of the seed. Let's suppose our organism RP plants, the organisms that Gregor Mendel actually worked on. Now, this gene codes for some other protein for a third trait, and this codes for yet another protein for another trait. Now, notice that there are essentially homologous genes on the second homologous chromosome, we have a purple gene adjacent to this one, a green gene adjacent to this one, and so forth.