Evolution - Evolution A journey of a thousand miles begins...

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Unformatted text preview: Evolution A journey of a thousand miles begins with a single step. 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 Lyell and Malthus • Geologist, Charles Lyell – Principles of Geology (1830) – Species could become extinct – How did new species arise? niformitarianism – Uniformitarianism • Natural laws apply to geology • Opposed to catastrophism • Thomas Malthus – Populations increase until disease and famine overtake – Believed in controlling human populations Charles Darwin & The Voyage Of The Beagle The Five Year Voyage Galapagos Islands Darwin’s Finches 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 Darwin proposed in 1859 that differential survival and reproduction of individuals would produce changes in populations over time I have called this principle, by which each slight...
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This note was uploaded on 08/13/2010 for the course BIO BIO 213 taught by Professor O'neil during the Winter '10 term at Cal Poly.

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Evolution - Evolution A journey of a thousand miles begins...

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