I never said to ignore the question.

Experiments require resources which are limited. And after the falsification of intelligence genes, it makes sense to find a psychological cause for delay of gratification first, and test other logical explanations second.

Edit: I was wrong. Reading Wikipedia article (https://en.wikipedia.org/wiki/Heritability_of_IQ), it seems intelligence is related to both genes and enviroment.

I want to praise you for taking the time to admit that you were wrong about a topic you didn't know much about. It is something that is seen far too infrequently in this world.