Fig. 1.—

Evolution of ORs on the Drosophila phylogeny. A: Distribution of gene gains (above branches, in bold) and losses (below branches) on a cladogram depicting phylogeny of 14 Drosophila species; values at the right of each terminal or internal nodes are the number of genes calculated by BadiRate using BDI-FR-CML model. Alternative positions of genes for which there is no reconciliation of gene trees (supplementary fig S2, Supplementary Material online) with BadiRate distribution are highlighted in red. B: Distribution of the gene family size rate variation mapped on a time-tree. Each branch in the tree has overall rate of variation (rate of gain + rate of loss/(divergence times)) followed by the beta (β) and delta (δ) parameters describing, respectively, birth and death rates from the BadiRate analysis. β and δ values are rounded at the fifth integer. C: boxplots of overall rate of variation, beta, and delta.