BIOL 3200 Lecture 11: BIOL 3200 lecture 11
Document Summary
Lecture 11: it (cid:272)a(cid:374)"t produ(cid:272)e a(cid:374)y great or sudde(cid:374) (cid:373)odifi(cid:272)atio(cid:374), o(cid:374)ly a(cid:272)ts (cid:271)y short, slow steps, natural selection. Slight individual differences were found in offspring that arose from common parents. These slight differences would be the sources of evolutionary change and accumulate by natural selection to give rise to differences between species. From these assumptions, darwin rejected the idea that there were fundamental traits which never changed within a species that defines a species. He reje(cid:272)ted (cid:862)esse(cid:374)tialis(cid:373)(cid:863) at the spe(cid:272)ies le(cid:448)el: essentialism is the view that, for any species, there is a set of characteristics which are necessary to its identity and function. Dar(cid:449)i(cid:374) said i(cid:374)di(cid:448)idual differe(cid:374)(cid:272)es (cid:449)ere (cid:862)real(cid:863) a(cid:374)d spe(cid:272)ies a(cid:374)d other types (cid:449)ere(cid:374)"t real, (cid:271)ut a(cid:271)stra(cid:272)tio(cid:374)s. This broke on of the central concepts shared my many philosophers: philosophers initially stated that species were real, and individual variations occurred within them.
