unilateral suppression unilateral suppression (complete) 2013-06-05T21:38:36Z An effect in which the perturbation of one gene, which has no effect on the phenotype in question, is combined with the perturbation of another gene, which causes the mutant phenotype in question, and results in the complete suppression (to wild type) of the mutant phenotype. With respect to any single quantifiable phenotype, this may be expressed as an inequality as: a < ab = b = wt [E = a] OR wt = b = ab < a [E = a] where 'a' and 'b' are the observed phenotype values of the individual perturbations, 'ab' is the observed phenotype value of the double perturbation, 'E' is the expected phenotype value of the double perturbation, and 'wt' is the wild type phenotype value. MI:1293 PSI-MI orchard