Figure 2

Hierarchically clustered heatmap indicating relationship between species and stage specific expression patterns for the 2,006 genes detectibly expressed in all three pure species and the hybrids. (M) Drosphila melanogaster; (H) Hybrids; (Se) D. sechellia; (Si) D. simulans. Clustering relationships were bootstrapped, and all clusters are supported at the 95% level with the exception of the M-H pair indicated by the dagger (†). Genes indicated in red are expressed at a lower level than the reference sample whereas those in green are expressed at a higher level than the reference. All log₂ transformed expression ratios are scaled between -3 and 3 by the software.