Figure 2
From: Mapping of disease-associated variants in admixed populations
Local and global ancestry for three unrelated admixed African American individuals. Blue indicates two chromosomes of African ancestry, red indicates two chromosomes of European ancestry, and black indicates one chromosome of African ancestry and one chromosome of European ancestry. (a) An individual with a low proportion of African ancestry is depicted. (b) An individual with similar proportions of African and European ancestry is depicted. (c) An individual with a high proportion of African ancestry is depicted. The histograms on the right indicate the genome-wide frequencies of the three local ancestry values. Global ancestry equals the average of local ancestry divided by two (to account for diploidy). Among self-identified African Americans, the proportion of African ancestry can range from 0 to 1, representing the full range of variation. The information content of the local ancestry plots on the left is considerably higher than the global ancestry summaries on the right.