Heterozygotes are WT and segregate WT, steriles with a tumorous germline (gld-1 homozygotes), and Uncs that lay non-refractile eggs that fail to hatch (gna-2 unc-55) homozygotes.

Heterozygotes are Egl and Paralyzed. Segregate embryonic lethals (n499) homozygotes. Segregates WT animals that lay only non-refractile eggs that fail to hatch. Pick paralyzed Egl worms to maintain (eggs on the plate should all be pale brown and non-refractile; presence of refractile eggs indicates a recombination has occurred). XA780 recombines at a frequency of about 1%.