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the claim
IQ scores correlate strongly between biological relatives
the verdict
SUPPORTED
the evidence backs this
refutedsupported
the weight of evidence
3 sources for · 0 against

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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The analysis

The retrieved literature contains multiple robust studies and reviews (e.g., Plomin & Deary 2014; Savage et al. 2018; Scarr & Weinberg 1978) confirming that intelligence is highly heritable and correlates strongly among biological relatives. There are no papers refuting this well-established consensus.

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.
The paper trail · every fact has a biography
first checked31 Jul 2026
judged → SUPPORTED · 9331 Jul 2026
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