>>3979173 (OP)Depends on the genes, the cost, and the risk. If there was a 30% chance my daughter could have breast cancer by the age of 40 then I could see a compelling case to alter that gene. Beyond that, like making sure my son was 8 ft tall with a BWC that hangs to his knees, no I wouldn't do that. Such a thing would be an abomination unto nature and God, subverting the natural mechanisms of adaptation, while the more subtle approach would be more in line with skipping a tragedy to move natural selection forward a single generation.