Download 11.2 Natural Selection in Populations Stabilizing Selection

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11.2 Natural Selection in Populations
Populations, not individuals, evolve.
11.2 Natural Selection in Populations
A normal distribution graph has a bell-shaped curve.
– highest frequency near
mean value (middle)
• Traits not undergoing
natural selection have a
normal distribution.
11.2 Natural Selection in Populations
Microevolution
Evolution within a population
that creates new alleles, not
new species.
11.2 Natural Selection in Populations
Natural Selection Types
Directional Selection- favors phenotypes at one extreme.
11.2 Natural Selection in Populations
Stabilizing Selection- favors the intermediate phenotype.
11.2 Natural Selection in Populations
Disruptive selection- favors both extreme phenotypes.
11.2 Natural Selection in Populations
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