Fig. 1. Structure of the different P elements used to induce the swapping of Fab-7 by scs. The 3.1 kb fragment (containing the Fab-7² deletion) that serves as ectopic donor in the gene conversion experiment is drawn in dark blue at the scale indicated at the bottom of the figure. The iab-7PRE abutting the Fab-7 boundary is indicated. This Fab-7 fragment is inserted in front of a miniwhite gene within a P-element (the feet of the P element are indicated by black rectangles; the miniwhite gene in red is not drawn at scale). The structure of the SCS element that was inserted in the NsiI site just upstream from the Fab7² deletion endpoint is shown in green above the Fab-7 DNA line with a few relevant restriction sites (drawn at the same scale; B, BamH1; H, HpaI: M, MluI; P, PstI). The promoter driving transcription under the control of the iab cis- regulatory domains from within the BX-C is indicated in dark green. The promoter described by Avramova and Thikonov (Avramova and Thikonov, 1999) is shown in light green. The percentage of pairing sensitive lines from each construct is indicated with the numbers of lines scored (only homozygous viable lines are reported).

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