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Correlations in brood sex ratios between two half-sib broods before and after parental exchange. (A) Half-sibs of the common mother with different fathers (N = 47; r = 0.42; P < 0.01 after sex ratios were transformed to the underlying m-value). (B) Common father with different mothers (N = 47; r = 0.47; P < 0.001).
