Figure 6.
X/autosome divergence ratio in D. simulans and D. melanogaster. The X/A divergence ratio is expected to be unity assuming that the X and autosomes have the same effective population size in the ancestor of these species. In support of this, synonymous nucleotide diversities on the X and autosomes are approximately equal in African populations of both species (Andolfatto 2001). The distribution for X/autosome divergence ratios reflects 10,000 bootstrap samples with replacement by gene across the various site classes, separately for genes on the X and autosomes. Refer to Supplemental Table 7 for bootstrap P-values.
