And no matter how many times we try to mate them, we will always get that same result. So that is what we mean by a true breeding plan. A true breeding plan for any one of these trades listed below will produce only that trade generation after generation. Now, let's actually take a look at one of the first experiments that he conducted. So experiment number one in that experiment, mendel basically made it, he crossed two different true breeding plants for opposite or contrasting traits. So what do we mean by that?