Principal component analysis of Y chromosome specific SNP variation between haplogroups.

<p>A. The figure shows the graphical representation of the first two eigenvectors after PCA analysis. Y-axis corresponds to the first vector explaining 24.1% of the variation and X-axis explains 13.4% of the remaining variation. Each dot represents the results from one individual and the colour represent each HG as denoted by letters in the figure. The plus symbols in black denote individuals for which HG determination was ambiguous. The black triangles denote individuals for which no HG could be assigned. B. The results from the individuals carrying the blue-grey dupl are represented in blue, while the results from individuals carrying “blue-grey like dupl.” are in red. All cases are included within the NO-M214(xM175) haplogroup. In total 11 individuals carry these variants (<a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0137223#pone.0137223.t001" target="_blank">Table 1</a>) but they are superimposed in the figure, due to high similarity between their HG.