So, we want to understand why selection hasn't wiped out genetic variation. Ignoring the fact that I'm months (months) behind in responding to this prompt, let's dive in to explore it more in-depth.
Selection is a big part of fitness and mating. Different traits may be more appealing to others for enhancement. If we didn't have that variety and everyone had the same exact traits, that could be detrimental to a species/organism. Maintaining that genetic variation within populations will improve the chances for those species/organisms and others that are likely to be impacted by gene flow. We wouldn't have all of the variety we have today without genetic variation.
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