Thursday, February 24, 2011

Blog #4 -Describe the three types of selection: directional, stabilizing and disruptive

Directional selection: is a mode of natural selection in which a single phenotype is favored, causing the   allele frequency to continuously shift in one direction.

Stabilizing  selection: is a type of natural selection in which genetic diversity decreases as the population stabilizes on a particular trait value.

Disruptive selection: describes changes in population genetics in which extreme values for a trait are favored over intermediate values.

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