Figure 1
From: Genetic constraints for thermal coadaptation in Drosophila subobscura
Latitudinal cline of O st gene arrangement and schematic of chromosome O in Drosophila subobscura. (a) Lines in the Palaearctic region connect places at which Ost depicts similar frequencies, and show a clear northwest-southwest cline (O3+4 shows an opposite cline). (b) Approximate location of genes Hsp68 and Hsp70 on chromosome O. The three gene arrangements used in the experiment are labelled on the right side of the schematic representation, with the centromere placed on the left (solid circle) and the telomere on the right. O3+4 consists of two overlapping inversions, and O3+4+8 of three.