Heterozygotes have Unc-24 phenotype and segregate additional hets, embryonic lethals (stDf7/stDf7) and Unc females (or sometimes hermaphrodites) that Twitch.

Segregates heterozygotes that display only the unc-82 phenotype: slow but normal movement, disorganized muscle structure, somewhat Egl. stDf7 homozygotes die as embyros. unc-44 unc-82 homozygotes generally die as coiled, poorly-moving larvae.