BIOL 3200 Lecture Notes - Lecture 18: Materialism, Nicolaus Copernicus, Ernst Haeckel
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Preformationism: described the development of the organism from the egg: this opposed the views of epigenists, they argued that organs developed gradually from formless ho(cid:373)oge(cid:374)ous (cid:272)o(cid:374)ditio(cid:374), to a(cid:374) (cid:862)arti(cid:272)ulated heteroge(cid:374)eous state(cid:863) In first decades of 19th century, evolution came to be defined as sequence of events during development. Richard argued that evolution took on both meanings: described embryological development and species transmutation. Recapitulationism eventually declined in late 19th century b/c they found no simple linear progression from invertebrates, to vertebrates, to humans. Embryos do pass through series of stages that correspond to their ancestors, not. All embryological characteristics reflect ancestral patterns: development also evolves. Later on it was discovered that haeckel has his cause and effect reversed: changes in ontogeny led to evolutionary change or phylogeny, not the other way around (cid:862)o(cid:374)toge(cid:374)(cid:455) does (cid:374)ot re(cid:272)apitulate ph(cid:455)loge(cid:374)(cid:455), it (cid:272)reates it(cid:863) Hae(cid:272)kel (cid:272)halle(cid:374)ged the (cid:272)hur(cid:272)h whe(cid:374) he tried to assert that (cid:862)(cid:373)a(cid:374) is a(cid:374) a(cid:374)i(cid:373)al(cid:863)
