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Biology 1001A
Tom Haffie

Definitions Genetic VariationVariation in the alleles of genesProvides the raw materials for natural selection Polymorphic Locus Its location within a gene that has a large number of possible sequences Fixation Of AllelesChange in a gene pool from a situation where there exist at least two variants of a particular gene allele to a situation where only one of the alleles remains Directional SelectionType of natural selection in which individuals near one end of the phenotypic spectrum have highest relative fitnessShifts trait away from existing mean toward the favored extremeExtremely common Ex Body size of Guppiespromote directional section for larger body size Stabilizing SelectionType of natural selection in which individuals expressing intermediate phenotype have highest relative fitnessExtreme phenotypes are eliminatedMost common mode of natural selectionEx Birth mass of human babyideal fitness is intermediate mass Disruptive SelectionType of natural selection in which individuals with expressing extreme phenotypes have highest relative fitness
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