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Variation in fertilization success values. The figure represents the variation in fertilization success values for the second male (open circles and whiskers) that can be originated from the same sperm competitive ability value for the second male. The example uses fixed values of s2, and s1values extracted at random from the distribution of sperm competitiveness S (A) or S normal (B). If F2 were a perfect estimator of sperm competitive ability the solid line should be obtained.
