Fig. 6.—

Weak deletion bias in mtpts. The distribution of indel sizes pooled across all angiosperm genomes in this study is skewed toward deletions (A). However, the observed skew is much weaker than those reported in bacterial and archaeal genomes and, instead, is more in line with estimates from eukaryotic nuclear genome (B). Indel bias measurements are from Kuo and Ochman (2009). Sample sizes (number of species) are indicated at the base of each bar. For the angiosperm mitochondrial genomes, only species with at least 20 mtpt indels were included. Error bars represent the standard error of the mean calculated based on log-transformed values.