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That's because intelligence is ~80% heritable! Or rather, ~80% of the variance in intelligence is explained by things you inherit.

• tylerhou 4y ago
  (Note: "inheritable" here is not exclusive to inherited genetics; it also refers to upbringing.)
  • dekhn 4y ago
    Generally, heritability refers to genetics, not upbringing. Specifically: "amount of phenotypic (observable) variation in a population that is attributable to individual genetic differences" It wouldn't make much sense to report things that were related to upbringing together with genotype, as those are specifically the two things you want to decompose.
    • NoImmatureAdHom 4y ago
      Yeah, dekhn you're correct. There are mechanisms of inheritance that aren't genetics (like heritable epigenetics, maternal effects, etc.), but when we're talking about "heritable" the vast majority is genes.