Actually, twin studies have shown that intelligence is at minimum 60% genetic, and possibly up to 90%. Your behavior and intelligence is mostly genetic. Researchers at Harvard have even developed a genetic test that predicts IQ. It's not very accurate at the moment as we still have much more to learn about what genes influence IQ, but it is still somewhat predictive.

Actually, twin stydies have shown that intelligence is at minimum 60% genetic, and possibly up to 90%. Your behavior and intelligence is mostly genetic. Researchers at Harvard have even developed a genetic test that predicts IQ. It's not very accurate at the moment as we still have much more to learn about what genes influence IQ, but it is still somewhat predictive.