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(a) Size distribution of all eggs laid by (i) mated mothers (n = 600, mean = 4.946, s.d. = 0.301) and (ii) virgin mothers (n = 379, mean = 4.946, s.d. = 0.365). (b) Logistic regression of sex-ratio (proportion of female offspring produced after mating) on mean egg size prior to mating. Grey area represents 95% confidence limits.
