I would also say that 50% of the intelligence can also be random so two intelligent people from a family of low IQ

Could have a child of very high intelligence which are works in reverse

I would also add that if two very intelligent and very high achievers have children their children would revert

To their genetic baseline

Also highly intelligent people due to assorted mating would in a modern society have children with each other

Which could lead a society divided along IQ

Imagine in the medieval time period or a period before industrialization

I highly intelligent man or woman of very high IQ would just end up marrying somebody from their village

Know they move to cities and won't comeback

Thought with USA housing prices they may come home to the middle America States

Also I may not always get your comments showing up in may email for some reason and I get

Emails for your articles notifications which are months old