Sci-Fi

Nope, there's already "Gene Therapy" aka "Therapeutic DNA" going on (and the WADA is very interested in trying to find a method to test for this and has had hearings about the process, benefits, possible abuses, etc) and used for many things (injury recovery, diseases, etc etc), so you basically have all the elements present to take the next step, which is the capability to engineer, manipulate, or splice DNA with the characteristics you want present/dominate. So you can have/create a bunch of test tube babies that one can study for stability and implant those deemed ideal into the womb and taken to full maturity. Nothing far fetched about it. People are paying big bucks now for sperm and eggs that have the dominate characteristics they desire for their future children..and there's even rumors of people that are in the process of having themselves cloned. There's an ethical question and nobody knows what will or can happen when an engineered person(s) procreates with the normal population.