Current Events > Do you think a person's intelligence is usually mostly inherited?

(+) Yeah! (+)

i think there's been many different studies done on this subject, your opinion?

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our genetics control literally every single aspect of us, it's crazy to think that there is no genetic component to intelligence. obviously your access to education and stuff like that are huge factors but i think a lot of a person's capacity for how well they can learn, reason, etc is based on genes
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Twins are pretty much the best options for testing.

Ridley, M., & Matthews, P. (1999). Genome: The autobiography of a species in 23 chapters (p. 12). London: Fourth Estate.

The same person tested Twice: 87%
identical twins reared together: 86%
Identical twins reared apart: 76%
Fraternal twins reared together: 55%
Biological Siblings: 47%
Parents and Children living together: 40%
Parents and children living apart: 31%
Adopted Children living together: 0%
Unrelated People Living Apart: 0%

Basically an identical twin with a shared upbringing is indistinguishable from the same person taking multiple tests, in terms of repeat-ability.

Raising twins apart drops the correlation, which suggests that upbringing has some sort of effect.

Fraternal twins have significantly less correlation than identical twins, meaning that genetics are playing a large role. However, they have a higher correlation than regular siblings. Which means that either sharing a womb has some sort of result (shared conditions of mother while brain developing, or similar external stimulus of epigentic factors), or perhaps having a constant companion of the same age causes some sort of convergence of development.

Biological Siblings are next in line. Not surprising. A big effect, but still a lot of variation. It's notable that siblings correlate more amongst themselves than with their of their parents. The mixed result of the parents genes are playing a role.

Adopted Children living together having 0% correlation contradicts something earlier - that suggests that nurture (alone) has zero influence.

tl;dr: it's about 50/50 nature vs nurture, with genetics playing a larger role in maximum potential and raising the minimum
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