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Mean individual seed mass (μg) as a function of the effective number of donors (Ke) in crosses with double paternity [estimated regression line: individual seed mass = 1086 (±100) μg – 334 (±68) × Ke]. Each dot is the mean seed mass of one cross (n = 15 crosses). If Ke is close to 1, most offspring have been sired by one male, when Ke is close to 2 both males each sired approximately half of the offspring.
