Fig. 1.—

Variable mitogenomes among 33 yeast species. The phylogenetic tree is based on seven core mitochondrial genes: cob, cox1, cox2, cox3, atp6, atp8, and atp9. Thick internal branches signify bootstrap values >80%. Mitogenome sizes of extant species, and estimated ancestral mitogenome sizes (with 95% confidence interval) are shown to scale. The average genome size is shown, when multiple conspecific genomes are available in the same extant species. The branches whose ancestral and descendant nodes have >4 kb difference in mitogenome size are colored (red for expansion, blue for reduction).