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the claim

IQ scores correlate strongly between biological relatives

the verdict

SUPPORTED

the evidence backs this

confidence 93/100

Extensive twin, adoption, and genomic studies consistently demonstrate that IQ and general cognitive function share a strong genetic correlation among biological relatives.

Evidence for · 3

Study of 300,486 individuals identifies 148 independent genetic loci influencing general cognitive function

2018 · cited by 774

Savage et al. (2018) identify numerous genetic loci influencing general cognitive function, supporting a strong genetic basis for IQ.

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More for · 2

Genetics and intelligence differences: five special findings

2014 · cited by 732

Plomin and Deary (2014) summarize extensive twin and genomic data demonstrating that intelligence is highly heritable.

The Influence of "Family Background" on Intellectual Attainment

1978 · cited by 376

Scarr and Weinberg (1978) show through adoptive and biological family studies that genetic differences account for the major part of family background effects on IQ.

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first checked31 Jul 2026

judged → SUPPORTED · 9331 Jul 2026

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