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    Galton, Fisher, and the biometrical tradition established... — Carmelics
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    Challenges→Traits cannot be attributed primarily to genes or primarily to environment in any fixed proportion

    Galton, Fisher, and the biometrical tradition established that additive genetic variance can dominate phenotypic variance even under gene-environment interaction.

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    Reasons For

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    • 1.Biometrical methods successfully decomposed variance into additive genetic and environmental components across multiple traits, empirically demonstrating genetic dominance.
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    • 2.Twin studies and adoption studies show high heritability estimates persisting across diverse environments, suggesting additive effects remain substantial despite G×E interactions.
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    • 3.Fisher's ANOVA framework mathematically proved additive genetic variance can remain the largest variance component even when G×E interactions exist.
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    Reasons Against

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    • 1.Early biometrical estimates relied on assumptions (random mating, no gene-environment correlation) that frequently violated reality, inflating heritability coefficients.
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    • 2.Gene-environment interactions often create nonlinear effects that additive models structurally cannot capture, making 'additive dominance' an artifact of the statistical framework.
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    • 3.Heritability is population-specific and environmentally-dependent; claims about dominance require specifying populations and conditions that classical biometrics often left vague.
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    Related

    Biometrical methods successfully decomposed variance into additive genetic and e...Early biometrical estimates relied on assumptions (random mating, no gene-enviro...Fisher's ANOVA framework mathematically proved additive genetic variance can rem...Gene-environment interactions often create nonlinear effects that additive model...
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    Heritability is population-specific and environmentally-dependent; claims about ...Traits cannot be attributed primarily to genes or primarily to environment in an...Twin studies and adoption studies show high heritability estimates persisting ac...

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