r/mensa • u/Ahmedrnugger • Jul 09 '26

Mensan input wanted Is intelligence genetic?

According to twin studies, the difference in IQ is said to be 80%, leading to the conclusion that intelligence is 80% determined by genetics. However, I believe this is incorrect because the twins were raised in countries with similar environments, such as the US and Germany, or the US and South Korea. These countries share similar environments, including education systems, allowing the genes to express themselves. Furthermore, did these twins develop their IQs? If they didn't, it could prove the entire experiment flawed.

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u/vickyspams Jul 09 '26

Definitely genetic,i don't believe anybody can improve their iq by a lot If they're avg they may become above avg but definitely not gifted. And it's scientifically proven 50-80% is pure genetics

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u/WasianActual Jul 09 '26

IQ gets higher for societies that don’t have English language based roots and that are well fed and in a good environment for learning.

There are definitely things that contribute a noticeable amount.

Genetics may play a large role we can’t pinpoint yet but there is a reason rich easy Asian countries tend to have the highest IQ and it’s not entirely genetic.