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Natural selection acts on genetic variation

Description
Mutations = accidental changes in DNA that may be passed on to the next generation
Non-lethal mutations provide the genetic variation on which natural selection acts
Sexual reproduction also leads to variation
Genetic material from two individuals is mixed
Directional selection = drives a feature in one direction
Stabilizing selection = produces intermediate traits, preserving the status quo
Disruptive selection = traits diverge in two or more directions
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