Use this population- or quantitative-genetics calculation when genotype counts, variance components, pedigree relationships, and ploidy follow the definitions assumed by the tool.

Genotypic variance

A finite measured or assumed value.

Phenotypic variance

A finite measured or assumed value.

The implementation follows this calculation rule: Compute broad-sense heritability as the ratio of total genotypic variance to phenotypic variance.

Broad-sense heritability

The calculated broad-sense heritability.

Allele frequencies and genetic parameters describe the sampled population and model. Population structure, relatedness, selection, genotyping error, non-random mating, environmental covariance, and omitted variance components can bias interpretation. Ratios and percentages become unstable when their denominator is small, uncertain, or defined differently between samples.

Inspect genotype counts and Hardy–Weinberg diagnostics, or fit a pedigree/genomic mixed model when individual records are available. Confidence intervals and replication across populations are more informative than a point estimate alone.

• Narrow-Sense Heritability

  Compute narrow-sense heritability as the ratio of additive genetic variance to phenotypic variance.

• Additive Variance Component

  Derive the additive genetic variance by subtracting dominance and epistatic components from the total genetic variance.

• Breeding Value EBV

  Estimate an individual breeding value as heritability times the signed phenotype deviation from the population mean.