Produces 27% XO male self progeny; nondisjunction is correlated with a high frequency of achiasmate X chromosomes in oocyte nuclei, and a reduced frequency of X chromosome crossovers. meDf4 disrupts the function of the cis-acting X chromosome meiotic pairing center. meDf4/+ heterozygotes produce 4-6% XO progeny, so the presence of meDf4 can be followed in heterozygotes by this weak Him phenotype.

Heterozygotes are WT and segregate WT, dead eggs, and larval lethals (eDf24 homozygotes). eDf24 = let(e2000).

Wild type, segregating Unc-101 (hIn1[unc-101] homozygotes), wild type and arrested embryos. eDf4 homozygote arrests as unhatched embryo at lima bean stage. Pick WT and check for correct segregation of progeny to maintain. This strain was generated by the Genetic Toolkit project, which should be acknowledged in any publications resulting from its use: The Genetic Toolkit is funded by the NIH National Center for Research Resources (NCRR) (USA) to Ann M. Rose, David L. Baillie, and Donald L. Riddle. Report all experimental results to Ann Rose.

eDf43 pka lin-49(e2173). Heterozygotes are WT and segregate WT, Unc-36, and LinDpys. The lin-40 dpy-11 homozygotes are Dpy, Sterile and abnormal. Maintain by picking WT.