Eugine_Nier comments on [LINK] Loss of local knowledge affecting intellectual trends - Less Wrong
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If there is still an influx of new copies due to mutation, then the frequency will increase because there's now less selection pressure driving the mutations out.
Influx of new copies for most alleles is generally negligible for any specific allele. Examples like Huntington's are extremely rare. The probability that any mutation will arise more than once in the population is generally extremely small. Standard genetic models often don't even bother taking into account the chance that a mutation will be matched because the chance is so small.