BIO Q. Does natural selection always increase genetic variation?

[299678]

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If not, please provide some examples for limiting genetic variations?

Does Balanced polymorphism increase genetic variability?

 

[Avery07]

If not, please provide some examples for limiting genetic variations?

Does Balanced polymorphism increase genetic variability?

No it does not.

Example: Stabilizing Selection. -- The most common trait is selected for while the less common are selected against thus decreasing genetic variation.