Famous Bad Decisions
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Transcript of Famous Bad Decisions
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Famous Bad Decisions
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1886 -Sors Hariezon
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1933-Joe Shuster & Jerry Siegel
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1955-Sam Phillips
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1862 - Ambrose Burnside
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1876 - George Custer
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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
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Differential Reproduction• 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
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Selective Pressure
• Nature “selects” for various phenotypes based upon whether or not the features of the organism increase its differential reproduction
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Modes of Natural Selection
• Stabilizing: Favors average phenotypes
• Directional: one phenotypic extreme favored
• Disruptive: Both extreme phenotypes are favored
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Directional Selection & Industrial Melanism (Kettlewell Moth Experiment)
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Transitioning Phenotypes
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Stabilizing Selection
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Stabilizing Selection
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Disruptive Selection
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Disruptive Selection
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Endler’s Trinidadian Guppy Analysis
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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
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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