Figure 4
From: Refining the evolutionary tree of the horse Y chromosome
Clustering of ancient samples and emergence of haplogroups. (a) Results from grouping of 149 samples (Y-axis) into four clusters based on number of derived/ancestral states of identifier variants (X-axis). (b) Illustrated summary of the clustering of all ancient samples (according to panel a). The number of identifier SNPs is given on the branches, and the number of samples in each cluster is given in the dashed circles. Groupings that were only detected in ancient samples are given in Greek letters. The spatiotemporal distribution of the 98 samples clustered in db and da1 is shown in the lower panel. The oldest samples in da1 and db, which are dated to the 4000–3500 BP period, are outlined. (c) Clustering of 53 sufficiently sequenced da1 samples into one of the mjHGs. The six samples that clustered to the basal node of the Crown (daC) are given on the right. Full information is given in Supplementary Table S5. (d) Hypothesized emergence and spread of Y haplotypes in domestic and Przewalksi’s horses on the basis of currently available data. Coloured lines represent detected, grey lines uncovered haplotypes.
