Genetic analysis of the lozenge gene complex in Drosophila melanogaster: Adult visual system phenotypes

Abstract

Mutations at the lozenge (lz) locus are pleiotropic, primarily affecting the sense organs for sight, smell and taste. To better understand the role that lz plays in the visual system, we investigated its complex genetics and the effect mutations have on the structure of the compound eye. Complementation analysis within the lz locus reveals two functional units necessary for a normal eye, cistrons A and B. Previous recombination studies identified four subloci spanning 0.14 m.u. Cistron A mutations map to the distal-most spectacle sub-locus, which has been identified as an insertion point for P-elements. Southern blotting and chromosomal in situ hybridization show that P-allele lzmr2 contains..