18.4 effects of different forms of selection on evolution
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what does stabilising selection select against?
extreme phenotypes
how does the curve change in stabilising selection?
curve becomes narrower & taller
when does stabilising selection occur?
environmental conditions being constant over a period
what phenotype do directional selection select against?
other extreme
how does the curve change in directional selection?
direction best adapted (left/right)
what conditions causes directional selection?
changing environmental conditions
what is selected against in disruptive selection?
average phenotype
how is the curve affected in disruptive selection?
2 peaks / 2 seperate curve
what environmental conditions results in disruptive selection?
environmental conditions taking on 2 distinct forms