Ch 22-Darwinian Evolution

Ch 22-Darwinian Evolution - Chapter 22 Darwin introduces a...

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Chapter 22
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Darwin introduces a new theory A new era of biology began on November 24, 1859, the day Charles Darwin published On the Origin of Species by Means of Natural Selection focused biologists’ attention on the great diversity of organisms book made presented two novel theories -current species are descendants of ancesteral species -Natural selection is a mechanism for evolution
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Darwinian theory was revolutionary Challenged traditional views
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Resistance to Darwin’s ideas Greek philosopher Aristotle Old Testament holds that species were individually designed by God and therefore perfect Carolus Linnaeus interpreted organismal adaptations as evidence that the Creator had designed each species for a specific purpose Founder of taxonomy -branch of biology concerned with naming and classifying organisms
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Fossils Paleontology helped to lay the groundwork for Darwin’s ideas Paleontology largely developed by French scientist Georges Cuvier Cuvier advocated catastrophism theory that each boundary btw/ strata represents a catastrophe -study of fossils Remains of traces of organisms Found in sedimentary rock, which appears in layers of strata
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Theory of Gradualism idea that profound change can take place through the cumulative effect of slow but continuous processes Geologists Hutton and Lyell perceived that changes in Earth’s surface can result from slow continuous actions still operating today This view strongly influenced Darwin’s thinking
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A different theory of evolution species evolve through use & disuse, i.e. inheritance of acquired traits Proposed by Jean-Baptiste Lamarck -unsupported by scientific evidence -acquired traits are not inherited
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Darwin’s Voyage on the HMS Beagle Charles Darwin always had a strong interest in nature After receiving his B.A. degree, he was accepted on board the HMS Beagle , which was embarking on a voyage around the world
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This note was uploaded on 04/07/2008 for the course BIO 102 taught by Professor Doll during the Spring '08 term at Loyola Chicago.

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Ch 22-Darwinian Evolution - Chapter 22 Darwin introduces a...

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