Figure 1.

Transgenes within the banded region of chromosome 4 can have a variegating or a nonvariegating phenotype. Six R lines and eight V lines have been characterized. Photographs of the eye phenotypes (representative samples) were taken from hemizygous y w^67c23; P[hsp26-pt, hsp70-w]/+ adult female flies. Map positions of the transgene inserts were established as described (Materials and Methods). The order of insertion sites is unambiguous, except that the relative positions of 118D-19 and 118E-25-5 cannot be distinguished. Abbreviations: C, centromere; T, telomere.