Fourth Reading f24.1-24.5, k 22.1-22.4

Fourth Reading f24.1-24.5, k 22.1-22.4 - Emily Lin 2/9/11...

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Emily Lin 2/9/11 Freeman 24.1-24.5, Klug 22.1-22.4 In 24.1, it gives a history on how the idea of evolution came about, straying from the “special creation” ideas of Plato and Aristotle’s “scala naturae”. Then came Lamarck’s theory of “evolution” was that existing species move up in complexity. Darwin claimed that instead of being unimportant or an illusion, variation among individuals in a population was the key to understanding the nature of species. Darwin explained this by “descent with modification”, alluding that all species have a common ancestor and have changed through time. Scientists looked at fossils trapped in sedimentary rocks that provided a geological time scale. Darwin also brought up vestigial traits, reduced or incompletely developed structure that has no function but similar to functioning structures and organs in closely related species, for example tails in monkeys and tailbones in humans. Darwin’s discovered the geographical relationship that showed phylogeny in mockingbirds in the Galapagos that showed a common ancestor but diversified species on different island groups. Homology is also important in recognizing similarities that exist in species descended from a common ancestor. This can be examined down
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This note was uploaded on 03/04/2012 for the course BIO 142 taught by Professor Escabar during the Spring '08 term at Emory.

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Fourth Reading f24.1-24.5, k 22.1-22.4 - Emily Lin 2/9/11...

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