 population of origin; the remaining columns are the genotypes). If you look carefully you should see that individuals from population 1 tend to have more <code>1</code> alleles in the later loci, whereas individuals from population <code>2</code> tend to have more <code>1</code> alleles in the earlier loci. This is because of the way that the allele frequencies were set up in the two populations. (Of course in real data the differences between different populations will not usually show patterns like this!