Hook up with sexy hermaphrodite
Males (5AA; X0) arise from fusion of nullo-X gametes (gametes that lack an X chromosome) and normal X-bearing gametes.
Nullo-X gametes are generated by spontaneous non-disjunction of the X chromosome during meiosis in the germ line.
Data emerging from this project is being incorporated into the male handbook and Individual neurons pages.
male larvae also switch to the facultative diapause stage called the dauer larva which can survive four to eight times the normal 3-week life span (Cassada and Russell, 1975).
Males differ from hermaphrodites in their expression of a number of behaviors including regulation of defecation (Reiner and Thomas, 1995), response to media conditioned by the same- versus opposite sex (Simon and Sternberg, 2002; White et al., 2003), mate-searching (Emmons and Lipton, 2003) and perhaps most striking of all, mating behavior (see Male Intro Fig 3; Male Intro MOVIE 1; Wormbook-Male Mating Behavior chapter; Emmons and Sternberg, 1997).
Examining male anatomy or gene expression patterns on any significant scale from such cultures is therefore impractical. In contrast to the hermaphrodite, earlier descriptions of the connectivity of the male nervous system were only partial (Sulston et al., 1980). Reconstruction of the whole male nervous system from serial EM sections as per the hermaphrodite (White et al., 1986; Hall and Russell, 1991), is currently under way (The Male Wiring Project). The male's copulatory apparatus, which consists of several structures, is also established in the tail. The structure of the nervous system of the nematode . A lateral extension of the cuticle, called the fan, extends from the tail and holds nine bilateral pairs of sensory rays (Male Intro FIG 1A, 2A and 2B).
Sulston and Horvitz (1977) identified three criteria for distinguishing the sexes at L1 (Male Intro FIG 4A).