Partially suppresses y2 and its partial revertants. In combination with mod(mdg4)ul the y2phenotype is completely suppressed. Dominantly suppresses the enhancing effect of mod(mdg4)ul on y2 : increases pigmentation in the body, wings and bristles of the thorax, leg, abdomen and wing. Partially suppresses the scD1 mutant phenotype. Suppression is enhanced by mod(mdg4)ul.