Well, to answer that question, what he did was he took the f one generation offspring and he made it it with itself to produce the f two generation offspring. And what he saw was that although about 75% of the f two offspring were in fact tall the remaining 25 were actually short. And that meant that this tall f one generation offspring had that shore trait in it all along. But it was being inhibited, it wasn't actually being expressed. So because of that, what he proposed was that each one of these plants contain two hereditary factors that code for that given trait. In this case for that given height.