reproduction, both because of errors in DNA copying and as a result of
sexual reproduction.
Variations in a population –inherited and otherwise- Illustration. Let us consider a group of twelve red beetles,
which reproduce by sexual reproduction and lives in the bushes with
green leaves. They are preyed upon by crows. As we know that
more the crows eat, the fewer beetles are available to reproduce.
Now let us consider various causes of variation in the population of
red beetles.