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The influence of sample size on estimated Φst among cultivars. Dots show the calculated genetic differentiation index (Φst) of each subset. Samples in various subsets were drawn 50 times from a total of 75 individuals. The regression formula applied was ln(Y) = b0 + (b1/t), where b0 and b1 are regression parameters, t the sample size and Y the genetic differentiation index (Φ st) of each subset.
