Figure WN20.8. (A) The fitness of φH2 relative to its ancestor φ6 decreases with frequency, but is still greater than 1 when it is common (red dots). Thus, φH2 will invade a population of φ6, but φ6 cannot invade φH2. Red dots show mean ± s.e.m.; dashed lines are regressions with 95% confidence intervals. The blue dots and lower lines show a control experiment, in which φ6 was competed against another clone identical except for the presence of a marker gene used in the fitness assay. (B) The payoff matrix estimated from A. Each entry gives the fitness of φ6 (top row) or φH2 (bottom row) when either φ6 (left) or φH2 (right) is common. (A, Redrawn from Fig. 2a in Turner and Chao 1999. B, Redrawn from Fig. 1b in Turner and Chao 1999.)

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