Illusions can be generated by population-based structure analysis. Individual genotype relationships from the CEPH-diversity 51 global population samples; neighbor-joining similarity trees were constructed from the matrix of pairwise differences (reprinted from Nievergelt et al. 2007). Panel A color codes the major world regions. The analysis correctly grouped individuals on this broad criterion. However, in panel B, the color code identifies the population source (number and text annotation represents different populations), showing intermingling of similarity within geographic regions. For details see the original paper (Nievergelt et al. 2007).
