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17:26>> Mendle doesn't know. >> Right. >> Okay. Mendle doesn't know anything about genes. He doesn't know anything about chromosomes. He just knows plants are doing this. Okay. So he takes a purely sort of empirical approach which is I'm just going to describe the mathematics as I see it. Okay. I'm going to make up some rules that are just math rules. Okay. About what happens. First thing he figures out and what we've already seen is the principle of dominance. There's two traits. One of them is going to dominate over the other. Yeah. Okay. In this case that we saw it was the um purple the purple trait which now we call an alil. >> Um there's two different types of alals the purple and the white. And the purple al is going to dominate over the um
18:09white alil which we'll call recessive. So there's dominant and recessive. That's the first thing you establish. Second is something that he establishes called the law of segregation. This is the segregation of traits. Okay. What he says is there's actually two copies of an alil that every individual has. And if I have a true breeding plant, um