Figure 5

Phylogenetic analysis of A. gossypii DS block 7. A. The arrangement of genes in the common ancestor of A. gossypii, S. cerevisiae, and K. waltii that were present in A. gossypii chromosome I was reconstructed and used to define the arrangement of genes corresponding to DS block 7. Genes were duplicated and/or rearranged according to the WGD and PGD hypotheses, and the number of evolutionary steps evaluated. Genes in A. gossypii and S. cerevisiae that were not shared by the three genomes were shaded in gray. For simplicity, they were not illustrated in K. waltii. Non-shared and duplicated genes were excluded from analysis. Under WGD, the minimum number of deletions measuring the 'structure' of the DS pattern is also listed. See Figure 3 for the meaning of star and arrowhead. B. Most parsimonious scenarios for a WGD event inferred by tree reconstruction. The length of the tree reconstructed in the absence of WGD was 36 steps.