01a evolution of an idea (7.2)

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01a evolution of an idea (7.2)

  1. 1. THE EVOLUTION OF AN IDEA
  2. 2. Georges Louis Leclerc de Buffon 1707-1788 • Believed species changed over time into less ideal form http://archive.defra.gov.uk/foodfarm/farmanimal/diseases/atoz/fmd/a bout/clinical-signs/pics-pigs.htm
  3. 3. Carl Linnaeus and Erasmus Darwin • Carl Linnaeus (17071778) • Erasmus Darwin (17311802) – Darwin’s Grandpa! • Both proposed life changed over time • Erasmus suggested all life arose from single common ancestor
  4. 4. Jean Baptiste Pierre Antoine de Monet, Chevalier de Lamarck • 1774-1829 • First to offer mechanism for evolution of species • Based on 2 principles: – use and disuse – inheritance of acquired characteristics http://www.sparknotes.com/biology/evolution/lamarck/section2.rhtm l
  5. 5. Analysis of Lamarck’s theory • Why is his theory flawed? • Which aspects of his theory were correct?
  6. 6. Fossil Formation • Fossils are preserved ancient remains of dead organisms • Fossils form more often in low oxygen environment and to hard-bodied organisms
  7. 7. Reading the Fossil Record • Most fossils are unusual and of unknown organisms • There are no fossils of most living species • Fossils are buried deep within rock formations • Fossils are found in unexpected locations http://www.copernicusproject.ucr.edu/ssi/HSB iologyResources.htm (Video on Fossils and Evolution) http://www.nps.gov/parkoftheweek/photo450.htm
  8. 8. Georges Cuvier (1769-1832) • Fossils of simple organisms are found in all levels • More complex are found at shallower depths • Fossils at shallower depths are more likely to be similar to living organisms • Proposed theory of catastrophism - global catastrophies such as floods caused widespread extinctions of species and that newly created set of species replaced extinct ones (species don’t change)
  9. 9. Charles Lyell (1797-1875) • Proposed uniformitarianism: very slow changes occur over very long periods of time
  10. 10. Homework • Page 293 #1-5, 7-10

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