| additivity | The quality or state of being additive. (05 Mar 2000) |
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| causal additivity | The relationship between two or more causal components such that their combined effect is the algebraic sum of their individual effects. (05 Mar 2000) |
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| interlocal additivity | The relationship among quantitative effects of different genetic loci such that their joint effect is equal to the sum of their individual effects; an absence of epistasis or interaction. (05 Mar 2000) |
| intralocal additivity | The relationship between alleles such that the quantifiable phenotype of the heterozygote is at the midpoint between those for the two homozygotes; an absence of dominance. (05 Mar 2000) |