File:Figure 1.13.1 in L. Cavalli-Sforza et al. (1994) modified by Population Genetics and Microevolutionary Theory57.51 book.png

English: Figure modified by Cavalli-Sforza et al. (1994). Caption from the book source: "Principal component analysis of the allele frequency data shown in Table 6.4 for five human populations scored for the ABO O allele and the Rh D− allele. The two perpendicular lines representing the first and second principal components are shown. Dotted lines show the perpendicular projections of each point corresponding to a population’s allele frequencies upon the first principal component line, and dashed lines show the perpendicular projections onto the second principal component. At the top of the diagram, the principal components are redrawn, showing the points of intersection of the perpendicular projections from each population. Source: Modified with permission from figure 1.13.1 in L. Cavalli-Sforza et al. (1994). Copyright © 1994 by Princeton University Press." (Templeton)