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Famous Bad Decisions

Famous Bad Decisions. 1886 - Sors Hariezon. 1933-Joe Shuster & Jerry Siegel. 1955-Sam Phillips. 1862 - Ambrose Burnside. 1876 - George Custer. 1929 – Trofim Lysenko. Head of Soviet Ministry of Agriculture Strong advocate of Lamarckian Evolution (acquired characteristics)

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Famous Bad Decisions

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  1. Famous Bad Decisions

  2. 1886 -SorsHariezon

  3. 1933-Joe Shuster & Jerry Siegel

  4. 1955-Sam Phillips

  5. 1862 - Ambrose Burnside

  6. 1876 - George Custer

  7. 1929 – Trofim Lysenko • Head of Soviet Ministry of Agriculture • Strong advocate of Lamarckian Evolution (acquired characteristics) • Attempted to vernalize wheat by freezing prior to germination

  8. DifferentialReproduction • The driving force behind evolution • Populations shift because not all members of the population have the same fitness • Nature provides selective pressures that determine who reproduces most

  9. SelectivePressure • Nature “selects” for various phenotypes based upon whether or not the features of the organism increase its differential reproduction

  10. Modes of Natural Selection • Stabilizing: Favors average phenotypes • Directional: one phenotypic extreme favored • Disruptive: Both extreme phenotypes are favored

  11. Directional Selection & Industrial Melanism (Kettlewell Moth Experiment)

  12. Transitioning Phenotypes

  13. Stabilizing Selection

  14. Stabilizing Selection

  15. Disruptive Selection

  16. Disruptive Selection

  17. Endler’s Trinidadian Guppy Analysis

  18. Trinidadian Guppy Analysis • Purpose: To see how the selective pressures of coloration and predation affect the phenotypic distribution in a population • Hypotheses to Be Tested: • Bright coloration leads to preferential mating, causing the population to shift towards bright. • Bright coloration leads to increased predation, leading to a phenotypic shift towards drab

  19. Procedure • To access simulation, google “Sex and the Single Guppy” • There are nine (9) combinations of predator and prey to test. • Each simulation should be run for 100 weeks. Stop manually at this point • BEFORE looking at analysis of results, record the phenotypic results, pop. size and # of Generations

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