Figure 1.

Map of 18 genetic markers on the gene arrangements of Drosophila pseudoobscura. The inversion events that gave rise the seven gene arrangements (TL, SC, CH, HY, ST, PP, and AR) are indicated by the colored arrows. The thick colored lines trace the locations of the six pairs of inversion breakpoints on the seven D. pseudoobscura gene arrangement cytogenetic maps, where the breakpoints are colored according the events in the right hand figure. For example, thick red lines represent the PP arrangement. The thin black lines show the locations of the 18 genetic markers that were sequenced in this study. The homologous marker and breakpoint positions on each gene arrangement are connected by vertical/diagonal lines.