Lec17 - Charles Darwin Theory of Evolution by means of...

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Charles Darwin & Theory of Evolution by means of Natural Selection mechanisms of microevolution genetic drift // gene flow // mutations natural selection Charles Darwin influences on his thinking decent with modification Evolution by natural selection condition necessary for Natural Selection to occur population - unit of evolution types of natural selection Tues 11/1/11
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In December 1831, Darwin left Great Britain on the HMS Beagle to explore the world The Voyage of the Beagle fig 2.3
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Darwin was intrigued by: Fossil beds of South America Species composition Plants and animals on volcanic islands Similar species fig 2.4 fig 2.5
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Prevailing thought prior to Darwin’s time: Darwin was strongly influenced by the writings of geologist Charles Lyell Lyell proposed geological processes Historical Context Darwin reasoned that: If Earth is very old and has been shaped by slow processes –
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Malthus’ “Essay on the Principle of Population” (published 1798) Historical Context Darwin was strongly influenced by the Malthus’ writings and reasoned that: - all though all organism have a potential - only a limited number
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Darwin made two main points in The Origin of Species: Descent with Modification Organisms inhabiting Earth today Natural selection was the mechanism for descent with modification not all individuals individuals best fit population becomes
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The result of natural selection is evolutionary adaptation: (a) A flower mantid in Malaysia (b) A Trinidad tree mantid that mimics dead leaves (c) A leaf mantid in Costa Rica
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Figure 13.5 In Nature – Descent with modification: Think about “artificial selection”
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