Differences in mean relative gene expression among genes (A) and chromosomes (B).

<p>Relative gene expression is shown as log₂ deviations from <i>D. simulans</i> and using <i>RpL32</i> (grey bars) and <i>RpS18</i> (white bars) as housekeeping reference genes (see <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0061575#s2" target="_blank">Materials and Methods</a>). A) Mean gene expression averaged across all introgression strains and B) mean expression per site of chromosome introgression. Error bars are 95% confidence intervals.