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Unformatted text preview: Chapter 22 Wednesday, January 21, 2009 5:58 PM DESCENT WIT H MOD I F ICAT ION: A DARWIN IAN V IEW OF L I FE 1. What is evolution and adaptation? o 2 main ideas: i. Change over time of the genetic composition of a population ii. Descent of modern organisms w/ modification from preexisting organisms o Evolutionary adaptation- accumulation of inherited characteristics that enhance organisms' ability to survive in specific environment 2. Pre-darwinian theory of evolution o Lamarack • Inheritance of acquired characteristics Bodies of living organisms are modified through the use or disuse of parts (ex: giraffe) These modifications are inherited by offspring This idea turned out to be wrong • Evolution by natural selection o Darwin and Wallace developed the theory independently • Darwin: voyage of the Beagle • Wallace: naturalist in Indonesia o Natural selection- the unequal survival and reproduction of organisms due to environmental forces, resulting in the preservation of favorable adaptations.environmental forces, resulting in the preservation of favorable adaptations....
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