genetic suppression (partial) 2013-06-05T21:36:07Z An effect in which the perturbation of one gene results in the amelioration or lessening of the severity/penetrance of a mutant phenotype caused by perturbation of another gene, in effect making the organism more, but not completely, "wild type" in character with regards to the phenotype in question. The phenotype of the suppressing perturbation may or may not be known. With respect to any single quantifiable phenotype, this may be expressed as an inequality as: a* < ab < wt [E = a*] OR wt < ab < a* [E = a*] where 'a' and 'b' are the observed phenotype values of the individual perturbations ('a*' being the most severe of the two), '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. PSI-MI MI:1291 orchard sub-suppressing genetic interaction genetic suppression