Heterozygotes show an increase in crossing over between kni and p^p. Heterozygotes show an increase in crossing over between se and kni, between kni and ss and between ss and e. Heterozygotes show an increase in crossing over between y and N. Heterozygous females show reduced disjunction and/or chromosome loss in oogenesis compared to controls.

Moderate maternal effects as seen by elevated w⁺ eye pigment levels in non-suppressor bearing offspring of Su(var)2-1 females. Removal of segments of heterochromatin from the genome by loss of the Y chromosome abolishes the suppression of the position effect variegation phenotype. The extent of hemizygous lethality is dramatically enhanced in the presence of extra heterochromatin ( attachedXX/Y females) whereas the lethality did not occur in the absence of the Y (X/O males). The effect of the Su(var)2-1²⁰⁷ allele is unchanged in heterozygotes with Df(2R)M41A10 (which lacks 2R heterochromatin). Viability of the Su(var)2-1²⁰⁷ heterozygotes is butyrate-sensitive.

Moderate enhancer of variegation at the lt locus.

Su(var)2-1²⁰⁷; Dp(2;2)Mdh3 double mutants display reductions in eye pigmentation.

Dominant suppressor of position effect variegation at the w locus caused by In(1)w^m4.

homozygous lethal