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Microevolution (genetic drift (founder effect (when few individuals…

- - - - resulting gene pool may no longer be reflective of original gene pool
      - if population remains small if may be further affected by genetic drift
- - - - some phenotypic differences are determined by a single gene (either or basis)
        
        ONLY GENETICALLY DETERMINED VARIATION HAS EVOLUTIONARY CONSEQUENCES
      - phenotypic differences are determined by the influence of 2+ genes and vary within a population
      - phenotypic differences can result from environmental influences