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Figure 2 | BMC Evolutionary Biology

Figure 2

From: The shape of human gene family phylogenies

Figure 2

Effect of large-scale gene duplications on imbalance. A gene family phylogeny (a) before and (b) after a genome duplication event. Im for tree (b) is 0.2. Tree (a) has Im 1, but expected mean Im is 0.5 for evolving to 6 taxa under the ERM model (there is a one-in-three chance of producing a tree as balanced as b). (c) and (e) Show results of two different simulations of genome duplications on trees evolving under the ERM model, showing mean Im and 2 standard errors around the mean for 500 trees each from 4 to 50 leaves. (c) Shows the effect of a single, recent genome duplication and (e) the effect of two consecutive ancient episodes of genome duplication (as shown in d). Recent duplications leave a larger signal in Im values, despite Im giving higher weight to basal branches [43].

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