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Heterosis as a function of migration rate (m) with and without gBGC. Solid circles were obtained by numerical integration of Equations 5 and compared to exact solutions of Equations 7. Thick solid line, b = 0; solid line, b = 0.00005; long-dashed line, b = 0.0002; short-dashed line, b = 0.0004; dotted line, b = 0.0005. Other parameters: N = 100, u = 10−6, λ = 2, h = 0, and s = 0.001.
