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Effect of QTL genotype on IPN resistance. Survival rates, in a challenge test for IPN resistance performed on Atlantic salmon fry, of offspring of parental pairs sharing 0, 1, 2, 3, or 4 copies of the high-resistance allele (Q) of the QTL. Thick line, median; box, quartiles; whiskers, 1.5 times distance from median to quartile; circles, data points outside the “whiskers” region.
