Genetics vs Environment
Commenters debate the roles of genetic heritability versus environmental factors in determining human traits like intelligence or IQ, often citing studies on heritability, twin/adoption research, and criticizing omissions of genetic components in articles.
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how do they know it's genetic and not environmental?
Actually it's more genetic than the environment.
Why doesn't the article mention genetics as a possible factor?
Definitely a genetic component as well!
There are genetic factors!
There’s a genetic component - don’t remember which gene, but only some are subject to its effects.
That doesn't account for the genetic component.
FWIW, your observation is not controlling for the contribution of genetics.
There's a reason why they're not just saying "it's genetics"...
Heritability does not mean "genetically determined".