Previously we discussed a very important experiment that was conducted by Gregor Mendel which basically gave rise to the law of dominance, the principle of dominance. So let's briefly recall what this experiment was. Let's summarize this experiment. So what Gregor Mendel did was he crossed a true breeding tall plant with a true breeding short plant. And every time he tried this experiment he always saw that the f one generation offspring was always tall. In fact, every time he tried to experiment with other traits he got the same exact result.