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Mean (±s.e.) relative adult fitness between F1 brothers and sisters from mixed-sex litters. Filled circles, lines selected for male T (HH), n = 13. Open circles, lines selected against male T (LL), n = 8. Cross symbols, control lines (HL and LH), n = 32. Sample size (n) refers to the number of mixed-sex litters (means taken within a litter). Error bars indicate 1 standard error.
