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bio102 lecture 1-11 - Biol 101/102 Lecture notes...

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1/11/08 Biol 101/102: Lecture notes - Evolution (Ch 12: 177-182, Ch 13: 196-205) In general sense: evolution is “change through time”; scientific definition is somewhat different and more specific (see below) Outline Evolution of evolutionary thinking (history) Darwin’s theories of evolution Evidence for evolution “The great chain of being” Aristotle’s “Scala Naturae” Species “fixed” – do not evolve Supernatural force Organized forms – lower to higher (e.g., jellyfish to humans) Erasmus Darwin – Charles’ grandfather One of earliest evolutionary thinkers Life came from “one living filament” (common ancestor) Temple of Nature (1802) (famous poem) John Baptiste Lamarck Organisms change over time (evolve) Mechanism: principle of use/disuse Inheritance of acquired characters Example – Giraffe As a species, giraffe was “created” Within a generation, stretched necks to reach juciest leaves
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