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Unformatted text preview: Chapter 22 Principles of Evolution Goals for Lecture 1 • Learn historical context for theory of natural selection • Understand how Darwin developed the theory, and his observations and predictions • Understand how “artificial” selection, biogeography, homologies and fossil record all support the theory • Theory is a general explanation of important natural phenomena, developed through extensive and reproducible observations • Hypothesis is a tentative explanation of observations Evolution-- Changes through time in populations • Darwin’s contributed the mechanism, natural selection • Putting the theory in historical context • Plato and Aristotle believed that species were immutable. • Cuvier recognized fossils and that they were extinct, and older fossils were in deeper rocks, but still thought species immutable.. • In the early 1800’s, Lyell realized geological formations were due to long term deposition • Lamarck developed the first theory for evolution, that structures evolved as they were used more. Giraffe’s neck is the classic example Fig. 22.2 Fig. 22.3 Darwin’s contributions • Darwin noticed different geographic faunae during his voyage on the Beagle • Darwin’s...
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This note was uploaded on 12/02/2009 for the course BIOL 1202 taught by Professor Gregg during the Spring '08 term at LSU.
- Spring '08