VUBio110BSp'08-MechEvolutionNS 9 POST new slides

VUBio110BSp'08-MechEvolutionNS 9 POST new slides - •...

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And finally—natural selection as an adaptive mechanism of microevolution
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Voyage of the HMS Beagle
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Populations have the potential to increase exponentially Populations are fairly constant in size Natural resources are limited Variation within a species and variation is inherited There is struggle for existence. Only some individuals survive Those with favorable variation are more likely to survive / reproduce Accumulation of variation (change) over time is evolution observations deductions Darwin’s Observations and Deductions
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How Natural Selection Works
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Unformatted text preview: • Variation in traits (heritable variation) • Overproduction of offspring • Struggle for existence – Resources are limited – Malthus on human populations • Differential survival AND reproduction – “Survival of the fittest”? Modes of natural selection (note: selection acts on phenotype) Directional Selection Stabilizing Selection Disruptive Selection http://www.brooklyn.cuny.edu/bc/ahp/LAD/C21/C21_Disruptive.html Disruptive Selection...
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This note was uploaded on 04/07/2008 for the course BSCI 110B taught by Professor Due during the Spring '08 term at Vanderbilt.

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VUBio110BSp'08-MechEvolutionNS 9 POST new slides - •...

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