BIO 213-F09 - Lecture 9 - Evolution

BIO 213-F09 - Lecture 9 - Evolution - Evolution A journey...

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Evolution A journey of a thousand miles begins with a single step. http://www.pbs.org/wgbh/evolution/library/02/2/quicktime/l_022_04.html
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Jean-Baptiste Lamarck 1. Tendency to perfection an increased complexity – Simple organisms at bottom rung of a ladder leading to more complex organisms – Humans at the top 2. Animals due to an ‘inner feeling’ could grow organs to adapt to environment – These could be passed down to offspring
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Lyell and Malthus • Geologist, Charles Lyell Principles of Geology (1830) – Species could become extinct – How did new species arise? – Uniformitarianism • Natural laws apply to geology • Opposed to catastrophism • Thomas Malthus – Populations increase until disease and famine overtake – Believed in controlling human populations
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The Five Year Voyage
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Darwin’s Finches
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Origin Of Species Descent with modification Natural selection and adaptation All species produce more offspring than survive – only a fraction live to survive each generation Variation in populations Variation is inheritable Differential adaptedness Differential reproduction
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Darwin proposed in 1859 that differential survival and reproduction of individuals would produce changes in populations over time
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I have called this principle, by which each slight variation, if useful, is preserved, by the term Natural Selection . -Charles Darwin from "The Origin of Species" http://www.pbs.org/wgbh/evolution/library/11/2/real/e_s_4.html
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Survival of the fittest – Those individuals best adapted to their environment survive
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Peppered Moths Show Natural Selection
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Natural Selection In Action • Observable phenomena • Example: – Pesticide Resistance in Insect Populations
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Australia and it’s rabbits • Twelve European rabbits
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BIO 213-F09 - Lecture 9 - Evolution - Evolution A journey...

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