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Unformatted text preview: c. Fossils provide us with a record of the changes that have to happen to organisms over time D. Anagenesis vs Cladogenesis a. Anagenesis The gradual transformation from one species to the next i. Phyletic gradualism: How one species transformed into another ii. Based on Microevolution (Proposed by Darwin) iii. No species per se, everything in constant flux b. Cladogenesis Emergence from fossils of several descendent species i. Long periods of stability followed by sudden change (cuvier) ii. How do new species appear by their ancestors? E. Punctuated Equilibrium a. Gould and Eldredge propose long periods of stability and sudden spurts of speciation b. Drastic changes in environment modify the gene pool i. Break up populations ii. Rapid from a geological perspective iii. Difference seem major, but not really c. No balance or direction in nature...
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This note was uploaded on 11/01/2010 for the course ANTH 1102 taught by Professor Gonzalez during the Fall '08 term at University of Georgia Athens.
- Fall '08