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Unformatted text preview: Lecture #3 Processes of Evolution Evolution within a single population: A trait can affect:-survival up to reproductive age . not able to have offspring-number of offspring... more offspring means more geneotypes-number of successful offspring-mating success (sexual selection)-others Only evolution by natural selection can produce long term adaptaions in a population- directional selection, frequency grows in one direction and falls in another pocket mice in different habitats have lighter or darker fur colors in order to better blend in with their surrurdings- Selection for or against "extremes" disruptive selection stabilizing selection distribution narrows...critical to look at the frequency Darwin's Natural Selection Argument p. 466 Observations idiviuals in a population vary in thier heritable chara. and organisms produce more offspring than the env can support Inference Indi. that are will suited to their env, tend to leave more ofs than other indiviauls and over time favorable traits accumulate in the population Q: Are all 4 of these required for natural selection? Q: Are all 4 of these required for natural selection?...
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This note was uploaded on 04/14/2010 for the course BIO 88509 taught by Professor Hagen during the Spring '10 term at Kansas.
- Spring '10