It s a kind of science fiction which in the present day level of genetic engineering is not possible to bring perfection to targeted results. There may be some trial efforts but that may end into a fiasco or horrible results. Yes, its most probable. Still there is a catch. If you are not guilty and do not want to deceive anyone, be bold and expressive. Follow Himalyan saints directions to meditate by engrossing yourself with nature and constatnly envision at mind and soul level, to develop qualities in the foetus, of a person you like. Remember, you can not deceive your own soul. So be honest and truthful and achieve from nature what you want. Hope this bitter answer will be helpful to you.