FIG 1.

Heat map of allele dosages (0, 1 or 2) across 34 approximately independent SNP markers from Chromosome 22 for a sample of $N=205$ African individuals, who are either Yoruba in Ibadan, Nigeria $\left(N_{YRI}=108\right)$ or Luhya in Wubye, Kenya $\left(N_{LWK}=97\right)$. Population-specific allele frequencies of each marker are depicted in the bar plot below. The user must decide, on the basis of differences in observed allele frequencies, whether the African sample should be treated as a single panmictic population.