 Medical DNA purification techniques have allowed humanity to rid themselves of the once pesky and sometimes fatal hereditary illnesses like Marfan syndrome, Down syndrome and muscular dystrophy creating areas of the world where these diseases are entirely extinct.DNA alteration of simple racial and physical features is also very common, allowing skin tone, eye color, breast size and more to be manipulated without surgery.Cloning is an accepted practice for creating extinct animals and humans for a variety of desires from the subtle to the lavish.