Chapters 22

Chapters 22 - Chapters 22,23,25,25 and maybe 26 If the...

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Chapters 22,23,25,25 and maybe 26 If the frequency of the recessive allele is 30%, the frequency of the heterozygous carriers would be 42%. January 20, 2010 What is evolution and adaptation? Two main ideas 1. Change over time of the genetic compositions of a populations 2. Decent of modern organisms with modification from preexisting organisms Evolutionary adaptation Accumulation of inherited characteristics that enhance organisms’ ability to survive in specific environments. Pre-Darwinian Theory of Evolution Lamarck Inheritance of acquired characteristics ( Lamarck’s idea) Used giraffes and that in past they had shorter legs and necks. They evolved by stretching necks and legs and it became longer. o Bodies of living organisms are modified through the use or disuse of parts o These modifications are inherited by offspring o This idea turned out to be wrong Evolution by Natural Selection Darwin and Wallace developed the theory independently Darwin- Voyage of the Beagle
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Chapters 22 - Chapters 22,23,25,25 and maybe 26 If the...

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