Additive genetic effects occur when two or more genes source a single contribution to the final
phenotype, or when
alleles of a single gene (in
heterozygotes) combine so that their combined effects equal the sum of their individual effects.
Non-additive genetic effects involve
dominance (of alleles at a single
locus) or
epistasis
Epistasis is a phenomenon in genetics in which the effect of a gene mutation is dependent on the presence or absence of mutations in one or more other genes, respectively termed modifier genes. In other words, the effect of the mutation is dep ...
(of alleles at different loci).
See also
*
Quantitative genetics
References
Genetics
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