# Additive Genetic Variance

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Related to Additive Genetic Variance: Quantitative genetics, narrow sense heritability

## Additive Genetic Variance

Evolutionary biology The ratio of altered genes and alleles to all of the genes that influence a particular traitSee Genetic variation

## additive

1. characterized by addition.

2. a substance added to another to improve its appearance, increase its nutritive value, etc. See feed additive.

**food additive**

material added to food; includes preservatives, emulsifiers, stabilizers, acids, nonstick agents, humectants, firming agents, antifoaming agents, colorings and flavorings, solvents, and even nutritive materials such as minerals and vitamins.

**additive gene action**

1. total contribution made by all loci to a polygenic trait.

2. when the heterozygote is intermediate in phenotype between the two homozygotes, i.e. a lack of dominance.

**additive genetic relationship**

the degree of relationship (number of genes held in common) between two individuals neither of which is inbred; the minimum relationship is 0 and the maximum is 1.0.

**additive genetic variance**

variance attributed to the mean effect of substituting one allele for another at any given loci.

**intramammary infusion additive**

agents, e.g. anti-inflammatories, added to improve pharmacological efficacy.

**additive relationship**

see

**additive genetic relationship**(above).## variance

one of the measures of the dispersion of data; the mean squared deviation of a set of values from the mean.

**additive genetic variance**

that portion of phenotypic variance which is due to the additive effect of genes (V

_{A}).**analysis of variance**

a statistical method for comparing values, expressed in terms of means or variance, of one or more variables in several subgroups of a population. Called also anova.

**non-additive genetic variance**

that portion of phenotypic variance which is due to epistatic interactions (V

_{I}) and dominance deviations (V_{D}).**non-genetic variance**

that portion of phenotypic variance which is due to non-genetic effects such as environment (V

_{E}).**phenotypic variance**

a measure of the extent to which individuals vary in their phenotype (V

_{P}). V_{P}= V_{A}+ V_{D}+ V_{I}+ V_{E}.**variance ratio distribution**

see f distribution.

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