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The Hox Gene Duplication
Sometimes a gene will get duplicated. That's one of a mechanism of a seems of evolution. It happens sometimes in the lab when there's sometimes genes recombine and they do it, they mismatch a little bit. And often gene duplication events like the Hox genes, we think they started out with probably one Hox gene and then it divided and there were two who did slightly different things from each other. They involved slightly different functions. So they duplicate and then they change and if that's good and it helps the animal survive, it may then be transmitted to future generations.