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Direct count deviations from the expected number of introgressed marker alleles in three natural hybrid zones between H. annuus and H. petiolaris. The linkage group shown is collinear between the genomes of H. annuus and H. petiolaris. Mapped molecular markers are given above and map distances below the linkage group. Independently selected chromosome blocks are indicated by +1 or −1, depending on the direction of selection. Redrawn from Rieseberg et al. (1999b).
