It's already routine to do genetic screening of in vitro embryos before selection for implantation. It is done to check for some of the more common deleterious

It's already routine to do genetic screening of in vitro embryos before selection for implantation. It is done to check for some of the more common deleterious genetic variations. But there is no reason that they couldn't check for other things like eye color. Eventually, of course, the embryos could also be modified by CRISPR or some similar technique, and those for which the genetic modification was successful would then be chosen for implantation. Outlawing this sort of thing is likely to have two effects: - ordinary folks will do it illegally in back street genetic engineering operations, and - rich folks will engage in medical tourism to some place set up to cater to their needs - a Cayman Islands of genetic engineering. PS - I'm not sure what the problem with cloning is, since identical twins, triplets, ... are naturally occurring clones.