Alleles at different loci can interact in a non-additive fashion in some behavioral traits.

Question

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Non-additive gene interactions, such as epistasis and dominance, can influence the expression of behavioral traits. These interactions occur when the effect of one allele at a locus depends on the presence of a specific allele at a different locus. Therefore, the effect of the alleles at different loci is not simply additive, and the resulting phenotype cannot be predicted by adding up the individual effects of each allele.

Alleles at Different Loci Can Interact in a Non-Additive Fashion