Lewontin's corn thought experiment shows within-group phenotypic variation can be genetic while between-group variation is environmental, since within-group heritability is irrelevant for…

Lewontin’s corn thought experiment shows within-group phenotypic variation can be genetic while between-group variation is environmental, since within-group heritability is irrelevant for determining causes of among-group differences.

Evidence

Heritability within groups is uninformative about differences among groups: Cases from behavioral, evolutionary, and statistical genetics (PNAS)

Categorization

• corroborated: 5 independent passages support this claim
• XREF: connects to: Intelligence is malleable and shaped by environment, not fixed by heredity — Harriet A. Washington, A Terrible Thing to Waste, 54; Genetic factors are often responsible for variation within populations, while environmental factors are usually responsible for variation between populations, per Rose’s causes-of-cases vs causes-of-incidence distinction. — Sick individuals and sick populations; High heritability of individual differences and large environmental effects on population-level IQ are mathematically compatible under a reciprocal gene-environment coupling model (Dickens & Flynn). — Does the raising IQ-raising g distinction explain the fadeout effect?

Related

• Lewontin’s corn thought experiment shows within-group phenotypic variation can be genetic while between-group variation is environmental, since within-group heritability is irrelevant for determining causes of among-group differences. (similarity 0.93)
• Genetic factors are often responsible for variation within populations, while environmental factors are usually responsible for variation between populations, per Rose’s causes-of-cases vs… (similarity 0.89)
• High heritability of individual differences and large environmental effects on population-level IQ are mathematically compatible under a reciprocal gene-environment coupling model (Dickens & Flynn). (similarity 0.88)