ch.22 - BIOL 1202 1-14-09 CHAPTER 22: DESCENT WITH...

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BIOL 1202 1-14-09 CHAPTER 22: DESCENT WITH MODIFICATION: A DARWINIAN VIEW OF LIFE I. a. Two main ideas Change over time of the genetic composition of a population Decent of modern organisms with modification from preexisting organisms b. Evolutionary adaptation Accumulation of inherited characteristics that enhance organisms’ ability to survive in specific environments Pre-Darwinian theory of evolution II. Lamarck a. Inheritance of acquired characteristics Bodies of living organisms are modified through the use or disuse of parts These modifications are inherited by offspring This idea turned out to be wrong III. Evolution by Natural Selection a. Darwin and Wallace developed the theory independently b. Darwin- voyage of the Beagle c. Wallace- naturalist in Indonesia IV. Natural Selection a. The unequal survival and reproduction of organisms due to environmental forces, resulting in the preservation of favorable adaptations b. Process “selects” from what is available in the gene pool
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This note was uploaded on 02/28/2009 for the course BIOL 1202 taught by Professor Gregg during the Spring '08 term at LSU.

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ch.22 - BIOL 1202 1-14-09 CHAPTER 22: DESCENT WITH...

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