Disregarding the ethical concerns, I have the following condition: http://en.wikipedia.org/wiki/Hypohidrotic_ectodermal_dysplasia Is it not as prominent as most cases, but I think that is luck rather than genetics (not sure). It goes on the x-chromosome. I am only 19 but I have often wondered whether sex selection science could avoid passing on this condition. On another note. Is the idea that men/women want children of their own (not adopted) due to biological characteristics true, or is this something just perpetuated by the media. Thanks for the info.