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03 - Oct 15 Evolution as a Theory.pdf

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Department
Biology
Course
Biology 1201A
Professor
Jennifer Waugh
Semester
Fall

Description
Biol 1201A – F2012 Waugh The Theory of Evolution •What is a theory? •Historical development of evolutionary thought •Darwinian evolution •Road map for the evolution course What is a theory? commonvernacular: •an untested idea or opinion; speculation scientific definition: •an explanation of a set of natural phenomena, based upon proven or testable hypotheses and observations Examplesof scientific theories: • Early evolutionarythought static classification and characterization •Aristotle (384-322 BCE) & the Scala natura •NaturalTheology (1700s) •Carl von Linne & the Linnean system (1707-78) •le Comte de Buffon (1707-1788) but…vestigial  traits 1 Biol 1201A – F2012 Waugh Early evolutionarythought transformationaltheory of evolution Jean-Baptiste Lamarck(1744-1829) species evolve to better fit their environment birth RA birth RA birth time use/disuse inheritance of acquired trait A.Many cave-dwellingorganismsare blind and/or lack developedeyes. Payne (1910) raised 49 generationsof fruit flies in the dark. B.Weisman(1889) cut off the tails of 5 generations of rats. What do YOU think happenedin this experiment? Early evolutionarythought Geologicalpatterns Georges Cuvier (1769-1832) • believed in the fixity of species • changes in fossil forms a result of repeated catastrophic events and new creations (‘catastrophism’) Charles Lyell (1797-1875) • natural agentscurre
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