My_Ch22_lecture_rev08(2009030423565550) - Chapter 22...

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Chapter 22: Evolution Descent with Modification Purpose : to understand Darwin’s theory of natural selection, and supporting evidence for evolution. (AP Themes: I— Science as a Process, II—Evolution, IV—Continuity & Change) What you MUST know from Ch 22: Lamarck vs. Darwin theories of evolution Natural selection Homologous structures Vestigial organs Historical context preceding Darwin: Read p 414-417 Carolus Linnaeus—founder of taxonomy (KPCOFGS) Georges Cuvier—first paleontologist (study of fossils) o Catastrophism—boundaries between strata caused by natural catastrophies o Categorized organisms based on comparative anatomy and how structures work to keep an animal alive in its environment James Hutton—geologist o Gradualism—geologic features are the result of slow, cumulative processes Charles Lyell—Uniformitarianism—geologic processes are the same throughout Earth’s history o Earth is VERY old (> 6,000 years) o Slow, gradual processes can cause significant changes over time
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Jean Baptiste Lamarck (1809, theory of evolution) 1. Use and disuse —body parts of organisms can develop with increased use, while unused parts atrophy (get smaller) and weaken (correct idea! Example: muscle development in athletes) 2. Inheritance of acquired characteristics —body features acquired during an organism’s life (increased muscle mass, giraffe’s long neck) could be passed on to offspring. (incorrect! Only genetic changes can be passed on to offspring)
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My_Ch22_lecture_rev08(2009030423565550) - Chapter 22...

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