He also examined the shape of the seeds. We have round seeds we have wrinkled seeds he examined the shape of the ponds we have inflated ponds and we have constricted pods and he examined the color of that seed coat that is around that actual seed and we have white and we have gray seed coats. So he basically took many of these pea plants and he conducted many different types of experiments. And two of these experiments are shown on the board and it's these two experiments that eventually led the way to the principle of dominance as we'll see in just a moment. Now, before he actually conducted these two experiments and many experiments like it he spent several years trying to develop a type or a line of pea plants known as the true breeding line of pea plants. Now, what exactly do we mean by a true breed?