Chapter 22 - Descent with Modification

Chapter 22 - Descent with Modification - Chapter 22 Descent...

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Chapter 22 – Descent with Modification: A Darwinian View of Life What is Evolution and Adaptation? o There are two main ideas: Change over time of the genetic composition of a population Descent of modern organisms with modification from preexisting organisms. o Evolutionary Adaptation Accumulation of inherited characteristics that enhance organisms’ ability to survive in specific environments. Some organisms survive more on average and the traits that they have will become more common in the gene pool. Pre-Darwinian Theory of Evolution o Lamarck Inheritance of acquired characteristics Bodies of living organisms are modified through the use or disuse of parts during their lifetime. These modifications are inherited by offspring because of the alterations the body goes through in a lifetime. o An example that Lamarck used was giraffes: early giraffes were short and spent a lifetime stretching their necks to reach food, so they passed on the longer neck and lengthening neck trait to their offspring. This idea turned out to be wrong. This idea was popular during the 1800s. Evolution by Natural Selection o Darwin and Wallace developed the theory independently Darwin – Voyage of the Beagle Went to Cambridge University in England, degree in divinity
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This note was uploaded on 08/29/2010 for the course BIOL 1202 taught by Professor Gregg during the Spring '08 term at LSU.

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Chapter 22 - Descent with Modification - Chapter 22 Descent...

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