Abstract
The formation of haploid gametes in sexually reproducing organisms is dependent on the pairing and recombination of homologous chromosomes (homologues) during meiotic prophase I. This ensures the faithful segregation of homologues at Metaphase I. Chromatids are separated at metaphase II (Hawley, 1988). At the onset of prophase I, sister chromatids of meiotic chromosomes become connected by axial elements (cores) which run along their entire length. Axial elements are called lateral elements, when they become interconnected by transverse filaments to result in the well known tripartite synaptonemal complex (SC) structure (reviewed by Moses, 1968; von Wettstein et al.,, 1984, Giroux, 1988). While chromosome pairing and meiotic recombination can apparently occur without SC formation (Roeder, 1990; Padmore et al., 1991, Hawley and Arbel, 1993; Loidl et al., 1994, Scherthan et al., 1994; Weiner and Kleckner, 1994, Nag et al., 1995), tripartite SC assembly seems to be a prerequisite for proper chiasma distribution, i.e. chiasma interference (Sym and Roeder, 1994).
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