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. 2014 Apr 17;9(4):e91883. doi: 10.1371/journal.pone.0091883

Figure 4. The evolutionary trajectory of fem gene substitutions in the evolutionary window that follows the putative gene duplication event in the Bombus lineage.

Figure 4

(a) The expected evolutionary fate of fem substitutions in the paralogous genes fem and fem1 under the models of concerted evolution and repeated gene duplication. (b) Deduced amino acid changes. The yellow box indicates the Fem protein, and the blue box indicates the Fem1 protein. Black letters above the boxes indicate the ancestral state of the amino acid residues found in the MRCA of B. terrestris and B. impatiens. Red letters in the red frame indicate the amino acid residues that evolved since the MRCA of B. terrestris and B. impatiens in the Fem protein. Blue letters in the blue frame indicate the amino acid residues that evolved since the MRCA of B. terrestris and B. impatiens in the Fem1 protein. Numbers before the boxes indicate the nodes (Fig. S2) used to infer the ancestral sequence information. aa denotes amino acid.