Typical trajectory of the system. (Top) Time evolution of the populations nA and nB (semi-log scale). (Bottom) Corresponding time evolution of the fitness f(t) (the fraction of cells in the A state). Parameters are: (γA, γB, kA, kB, f∗, β0, α) = (6, 1, 1, 1, 0.25, 1, −0.75).