Summary: Dominant crossover suppressor, uncharacterized with regard to structure, very stable. Very effective balancer for right portion of LG II from around dpy-10 to around unc-52.
Handling: Easy to manipulate. Heterozygous male stocks mate well. Very rare recombination gives rise to Dpy non-Unc and Unc non-Dpy progeny. The recombinant chromosomes carried by these progeny are homozygous lethal.