I say it's 50-50. Half is indeed hereditary which may translate as mentioned above. However, the other half is purely individual and may differ a lot from the hereditary background. Meaning that geniuses do in fact pop-up here and there without immediate logical justification. In conclusion, a human is 25% hereditary from the mother side, 25% from the father side and 50% an individual meant to continue their journey. Hence the three fundamental questions: Who are we? Where do we come from? Where are we heading?
The dumbing down processes have made this quest harder in the sense that the connection with the sacred has been heavily damaged; and easier on the other hand, because the competition is a joke once one comes to their senses.