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Fig. 8 | BMC Biology

Fig. 8

From: The house spider genome reveals an ancient whole-genome duplication during arachnid evolution

Fig. 8

WGD in Xiphosura is probably unrelated to the duplication of genes in Arachnopulmonata. Analysis of gene trees inferred from nine arthropod genomes was conducted, with the gene trees binned by topology. Trees corresponding to two separate duplication events in the most recent common ancestor (MRCA) of Xiphosura and Arachnopulmonata were binned as Hypothesis 3, and trees corresponding to a single duplication event in the MRCA of Chelicerata as Hypothesis 4. Top row of panels shows hypothetical tree topologies; bottom row of panels shows empirical examples. Right panel shows distribution of gene trees as a function of bin frequency, for two different tree sets (i.e., gene trees retrieved under two alternate filtering criteria). Note the limited support for Hypothesis 4, with empirical gene trees poorly matching the expected tree topology (contra empirical cases supporting Hypothesis 3)

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