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Unformatted text preview: (9-25-06) Hardy Weinberg Theory of Equilibrium
Conditions in which no evolution takes place o Population must be large o Mating us random o No migration o No mutation o No natural selection The Total sum of the genetic code in a population of breeding individuals o Migration o Movement into or out of a population Allele frequency changes caused by chance effects, not affected by selection o most common in small populations Gene Pool
- Genetic Drift
- Founder Effect - Type of genetic drift caused by sampling a small amount of genetic variation from the original
population in a group of individuals colonizing a new area o Syndactyly o Retinitis pigmentosa o Achromatopsia Lactose Intolerance
Inability to digest milk o Lactose production usually turns off in adolescence o Lactose ferments in large intestines o Gastrointestinal problems (Pastoralists tend to have a lower incident of lactose intolerance) Directional Selection
I.E. Peppered moths o Initially more light moths than dark moths o Environment changed o More dark moths than light o Environment changed o More light moths than dark Speciation - The splitting of one species into two or more species over time or the change of an earlier
species in a lineage to a new one later Allopatric Speciation - Formation of a new species over time as a result of geographic isolation between members of
an original single species Tempo of Evolution
Gradualism o Term used by Darwin o Slow gradual change Stasis o Period of little or no change Punctuated Equilibrium o Bursts of rapid change (like the axlotl (a type of salamander)) - ...
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This note was uploaded on 04/17/2008 for the course ANTH 101 taught by Professor Staff during the Fall '03 term at San Diego State.
- Fall '03