And nowadays we know that these hereditary factors are actually the genes that are found on our DNA. So remember, a gene is simply a sequence of nucleotides that are found within a DNA section. And these genes basically code for a specific type of trait, for a specific type of protein that expresses that given trait. So each one of these plants basically contains two of these hereditary factors. So let's express this mating process by using these hereditary factors to see exactly what we mean. So we begin with a true breeding tall plan.