Transition-Transversion Bias at the <i>CYTB</i> Gene Level in the Order Cypriniformes (Actinopterygii) as Evidence for the Influence of Metabolic Rate on Molecular Evolutionary Rate.

In contrast, transversion frequencies exhibit the opposite trend (Table S5 ): means are significantly higher in tropical taxa in two nucleotide substitution classes (Table S6 ), and differences in the mean rates of accumulation are highly significant ( F = 14.9; df 1 = 1; df 2 = 156; p < 0.001).

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Transition–transversion index values show a decreasing trend in tropical and mixed‐zone taxa, supported by four significant pairwise comparisons and a significant difference in mean rates of index change ( F = 5.0; df 1 = 1; df 2 = 252; p < 0.05) (Table S8 ). 3.6.

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