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Figure 1


Fig. 1. Sex-determination genes are among the handful of Drosophila genes known to be transcribed prior to nuclear cycle 14, the cellular blastoderm stage. Pre-cycle 14 (pre-CB) genes whose precise time of onset of transcription is known to within one nuclear cycle are ordered with respect to that parameter. The biological function of their pre-CB expression is also indicated. Pre-CB genes for which less precise information on timing is available include outstretched (Harrison et al., 1998), huckebein (Bronner et al., 1994), runt (Klingler and Gergen, 1993), twist (Thisse et al., 1988), brinker (Jazwinska et al., 1999) and short gastrulation (Markstein et al., 2002). Scale bar: 100 mm. a(Pritchard and Schubiger, 1996); b(Erickson and Cline, 1993); c(Barbash and Cline, 1995); d(Schejter and Wieschaus, 1993); e(Tautz et al., 1987); f(Ibnsouda et al., 1993); g(Eldon and Pirrotta, 1991; Kraut and Levine, 1991); h(St Johnston and Gelbart, 1987); i(Ingham et al., 1985); j(Coulter et al., 1990); k(Anderson and Lengyel, 1979; Lamb and Laird, 1976).





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