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Mean rank correlation, based on 1,000 replications, between squared difference of trait values of a sib pair and estimated i.b.d. scores at 100 ordered markers. Panels a and b pertain to the first and second loci, respectively, when the first locus, without dominance, explains 80% of the variation in trait values; panels c and d pertain to the first and second loci, respectively, when the first locus, with dominance, explains 60% of the variation in trait values.
