MOT,

There's a good link at wikipedia and the references on that page.

http://en.wikipedia.org/wiki/Heritability_of_IQ

I studied medical genetics but never came across IQ of gifted kids. My theory is that the environment has changed and just like you and Grinity mentioned, women have more choices and women with high intellect attracted to smart professional men and their kids likely to gain attributes from both parents. But there are some genetic variance that gifted kid may come from poor uneducated parents as well. The likelihood of that is much lower than the kid from the high IQ parents ofcourse.

Another thing is that we are more aware (knowledgeable) of our kids than our parents and grandparents. Just like we are more aware of autism and ADHD, we are more aware of the giftedness.

It's quite funny when you said "IQ is highly genetic (the potential, not the achievement)". I was friends with the twin (brother and sister) during high school and graduate years and their scores were quite similar even though they did not study together. But the boy hang out with the wrong crowd and he ended up getting his degree 2 years after his sister and not finding as much success in his life.

I am hoping that correlation of IQ in parents and kids are not 1 or not even close.

Just the thought: high IQ people got high IQ children but they tend to have few kids so that they can nurture and pay attention to their kids. low IQ people got low IQ children but they tend to have more kids because they don't worry much. What would happen in 200-300 years?