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Ideal output from a chromosomal ancestry inference program: ancestry for an autosomal chromosome pair from an individual (a) and from a second individual (b). For each point along the chromosome, the program indicates whether 0, 1, or 2 chromosomes carry the specified ancestry (light green). Realistically, programs indicate the probability of carrying 0, 1, or 2 chromosomes from the specified ancestry; in favorable cases, the program predicts the ancestry with near certainty.
