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Fig. 6 | Genome Biology

Fig. 6

From: Sex without crossing over in the yeast Saccharomycodes ludwigii

Fig. 6

Crossing over has been absent or unusually rare in Sd. ludwigii over evolutionary time. a Dendrograms of Sd. ludwigii strains, constructed by neighbor-joining analysis of all SNPs genome-wide (“whole genome”) or SNPs of individual chromosomes. The dendrograms of the remaining chromosomes are shown in Additional file 2: Fig. S5c. b Scores of tree difference (5 topological, unrooted metrics) between all combinations of whole-genome SNPs and SNPs of individual chromosomes, for Sd. ludwigii and L. kluyveri. The analyzed L. kluyveri strains and their corresponding dendrograms are provided in Additional file 2: Fig. S5d. The results shown here are based on normalized distances to the average values of 1000 randomly generated tree pairs (uniform average method). MAS: unrooted maximum agreement subtree distance; MS: matching split distance; RF: Robinson-Foulds distance; PD: path difference distance; Q: Quartet distance. c Decay of LD as a function of physical distance between SNP marker pairs, for Sd. ludwigii in comparison to representative L. kluyveri and S. cerevisiae groups of strains. The moving averages of the LD estimate r2 values are plotted for all SNP marker pairs (genome-wide) of different physical distances. All data (no line smoothing) for the first 2 kb of distance are plotted in the insets

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