A small number of loci explain the majority of phenotypic fitness variance

the verdict

REFUTED

the evidence says no

Recorded sources

0 sources for · 2 against

Counts group repeated records of the same source within each side. They do not measure evidence strength or source independence.

The claim that a small number of loci explain the majority of phenotypic fitness variance is refuted by genomic and quantitative genetics literature, which consistently demonstrates that complex traits are highly polygenic and shaped by numerous loci with small effects.

The analysis

The retrieved literature strongly supports the polygenic model of complex traits, where phenotypic variation is governed by numerous loci with small effect sizes rather than a small number of major loci. Paper [1] notes that most complex traits are polygenic with numerous small-effect loci. Paper [9] emphasizes that phenotypes arise from complex networks of many interdependent genes rather than simple one gene-one trait or oligogenic architectures dominating variance. Therefore, the claim is refuted.

Evidence against · 2

Polygenic adaptation and negative selection across traits, years and environments in a long‐lived plant species (Pinus pinaster Ait., Pinaceae)

Recorded source metadata

M. de Miguel, Isabel Rodríguez-Quilón, M. Heuertz, Agathe Hurel, D. Grivet, J. Jaramillo-Correa, G. Vendramin, C. Plomion, J. Majada, R. Alía, A. Eckert, S. González‐Martínez. Polygenic adaptation and negative selection across traits, years and environments in a long‐lived plant species (Pinus pinaster Ait., Pinaceae). 2022. https://doi.org/10.1111/mec.16367

Most complex traits are determined by numerous loci, each with a small effect size.

Source citation format

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More against · 1

Beyond Mendel: a call to revisit the genotype-phenotype map through new experimental paradigms.

Recorded source metadata

Tautz D, Pallares LF, Andersson L, Barghi N, Barton N, Bay R, Chan YF, Hancock A, Kaiser TS, Koenig D, Kontarakis Z, Liedvogel M, de Meaux J, Nordborg M, Palmer AA, Purugganan M, Schlötterer C, Schmid K, Stainier DYR, Weigel D, Wolf JBW, Ebert D, Gibson G. Beyond Mendel: a call to revisit the genotype-phenotype map through new experimental paradigms.. 2026. https://doi.org/10.1093/genetics/iyag024

Phenotypes arise from complex networks of many interdependent genes rather than a small number of loci.

Source citation format

The paper trail · every fact has a biography

first checked01 Aug 2026

judged → REFUTED · 1801 Aug 2026

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