Figure 2.

Randomization of chromosomal gene content after fixation of an increasing number of inversions. The conserved segments defined by at least two consecutive and independent markers (nonoverlapping) were considered as a single effective chromosomal site. This yielded a total of 87 positions for the analysis. Solid circles represent the mean values of Spearman's ρ from 1000 runs. Open circles represent the percentages of runs with a Spearman's ρ >0.3, that is, a correlation similar to that found between Drosophila melanogaster and Drosophila repleta.