Figure 1.
PC plot of biallelic Y chromosome polymorphisms by geographic region. The first three PCs of the Underhill et al. (this issue) data set plotted as PCs for 10 regional populations. This three-dimensional projection captures 61% of the variation present in the 20 haplotypes reported in the study. The root was placed by introducing a hypothetical population with a 100% frequency for the ancestral A1 haplotype into the analysis.
