So we accept the premise that certain genes = higher intelligence what now? Using this idea of "G" to judge a persons worth and then implement anything political is almost instantly going to lead to some very dark places very fast. There will always be a bell curve and you will always have people who want to say the 21% to the far left is a problem that needs to be dealt with. Crypto eugenics at its finest. The questions is not does genetics effect intelligence it is what hideous agenda are you trying to implement?