Natural selection has no selector. Artificial selection, practiced by breeders of agricultural plants and domesticated animals, has commonly been used as a model of the action of natural selection. For any given generation, natural selection is a consequence of the differences between individuals with respect to their capacity to produce progeny . . Artificial Selection, in contrast, is a purposeful process. Natural selection can and does take place in domesticated and laboratory organisms, and in mankind, under all sorts of natural and artificial conditions.
Artificial selection is man-made, however.