Schematic of dpy-18 and phy-2 mRNAs and
extent of deletions. Black boxes, exons; thin lines, introns; thick
line, genomic sequence; parentheses, extent of deletion; white
triangles, inversion. (A) The dpy-18 gene
encodes transcript Y47D3B.10. The dpy-18(ok162) allele
possesses a deletion removing exons 2–4 and a small inversion in exon
5. The dpy-18(e364) nonsense mutation resides in the
second exon. (B) The phy-2 gene encodes
transcript F35G2.4. The phy-2(ok177) mutation possesses
a deletion removing exons 4–7.