Correlation between sequence length, tree incongruence and bootstrap proportions. A) Number of different splits observed in bins of 5 trees is plotted against the average sequence length. B) Average bootstrap proportions within one tree plotted against the average sequence length. Both datasets, prokaryotic and eukaryotic, consists of 50 taxa. The polynomial regression is indicated as a colored dotted line. The black dotted line indicate the expected number of splits if all trees had identical topologies.