Allele frequency biplots of the three populations in the International HapMap Project dataset based on the Affymetrix Human Mapping 500K Set. A genome-wide allele frequency biplot of data for 90 CEU, 90 YRI, and 90 subjects of Asian descent (45 CHB and 45 JPT). The figure consists of 23 subfigures. Each subfigure presents an allele frequency biplot of one chromosome, where the four axes reflect the first two individual components and the first two SNP components in a rank-2 biplot (Appendix C). Samples from YRI (yellow line), CEU (red line) and Asian (blue line) were clearly classified into three groups.