why is genetic variation necessary for evolution to occur
Best Answer: Evolution by natural selection requires three ingredients: 1. Variation 2. Inheritance 3. Competition If any of these three factors are absent, no evolution can occur. They work *together*. The reason that variation is important is because there is competition among members of the same species.Namely, more individuals are born than can possibly survive to reproduce.So that means that some will produce more offspring than others.he reason that variation is important is because there is competition among members of the same species. Namely, more individuals are born than can possibly survive to reproduce.