What really happens with genes during incest? From what I understand there is a genetic pool of species and let's say there's a feature in some family like retracted jaw and if those people just keep breeding within themselves that jaw will be more and more retracted but if they go and breed with someone that's not family then that jaw will be going back to normal (average) of the jaw size of that genetic pool. So from my understanding it's like magnifying digital picture from let's say 100 pixels to 1000 pixels: same pixels start to copy themselves and you have blurry picture. But let's say hypothetically if there was just few people on some place could they genetically manipulate their genomes by going into genetic base and extracting some other genetic code to make "uninbred" offspring? Because let's face it human has many relatives and many people in his genetic past that made him. Like for instance very close relatives like brother and sister could they somehow reach and manipulate their DNA or chromosomes in a way to create "uninbred" offspring? Or for instance small group of people that are not related and will not have access to genetic pool manipulate their genes or chromosomes somehow to make their descendants free of one way inbreeding situations?