What should we expect to happen to the frequency in the population? We should expect it to stay roughly constant, because there’s no positive selection pressure.
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.
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.