So Gregor Mendel concluded that because the short trade reappeared in the second f two generation, that trade for the short plant was not lost during that mating process, during that crossing process. And this led directly into the principle of dominance. So Gregor Mendel argued that each trait in a given plant is controlled by two hereditary factors. 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.