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Decomposing Trait Variance into Genetic and Environmental Parts

The definitional core of the sub-domain. Heritability of any kind is a fraction whose denominator is total trait variance in a sample, so the split V_P = V_G + V_E has to exist as an object before any heritability node can be honest about what it is a fraction of.

Questions this Concept answers

Why is a heritability estimate a property of a particular sample rather than of a trait in the abstract?

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Broad-Sense and Narrow-Sense Heritability in Quantitative Genetics

In quantitative genetics, phenotypic variance — the spread of a complex, multifactorial trait's phenotypes across a population — decomposes into environmental variance and genetic variance, with gene…