Frameshift or stop mutation starting at codon 149.
Heterozygotes show an increase in crossing over between kni and pp. 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.
complements Su(var)2-13