There are three general outcomes of natural selection Number of individuals Original population Phenotypes (fur color) Original population Evolved population.

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Presentation transcript:

There are three general outcomes of natural selection Number of individuals Original population Phenotypes (fur color) Original population Evolved population Stabilizing selectionDirectional selectionDisruptive selection

Original Population TALLSHORT INTERMEDIATE BELL CURVE

Directional Selection Neck of Giraffe Moth color (melanin) Camouflage/Mimicry

Stabilizing Selection When the extremes of the trait aren’t as well suited Examples bird clutch size Human birth weight Human height

Disruptive Selection Causes divergence within the species Occurs when two different types of resources in one area Results in specialization for each branched group May lead to formation of new species E.g. Darwin’s Finches

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