If it is (as it must be) then breeding between two intelligent adults will on average produce more intelligent children than breeding between two dumb people, or between one intelligent and one dumb person.
Long before humans even knew of DNA or gene's we intuitively knew this and thus was born the concept of the aristrocry and why they only married each other or those who had newly earned their way into what was basically an elite breeding club.
Long before humans even knew of DNA or gene’s we intuitively knew this and thus was born the concept of the aristrocry and why they only married each other
Yes, that’s worked so well for the British Monarchy. I’m sure intellectual ability in part lies in the genes...personality and societal upbringing likely play a large part, as well. I don’t think it’s something you can simplify — idiot savants are quite the quandary.