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if an SNP were edited using CRISPR What are the chances that, absent artificial selection, wild type alleles would reemerge?

I am researching an FAAH SNP and FAAH out mutation that together lead to reduced pain sensitivity and reduced anxiety. I would like to know, if CRISPR was used to edit these genes to allow reduced anxiety and pain sensitivity would this likely carry on being passed down the generations or is there a high chance that wild type alleles would re-emerge? thanks!

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