Counts and ratio of preferred (U2P) and unpreferred (P2U) synonymous mutations in selfing and outcrossing genotypes of Eichhornia, as well as the ancestral branch connecting E. paniculata to E. paradoxa. The ancestral state is considered to be the nucleotide observed at each position in E. paradoxa. The colours along the branches reflect the putative model of change in mating system although the exact timing of the transition along each branch is not known. The branch lengths are not to scale.
Ness et al. BMC Genomics 2012 13:611 doi:10.1186/1471-2164-13-611