Model dynamics and long-term outcomes for varying maximum genetic quality, <i>γ</i>.

<p>(A) The mean cooperator frequency and (B) population size as a function of time for several values of <i>γ</i> and <i>β</i>. (C) The mean ±SD cooperator frequency as a function of <i>γ</i> for several values of <i>β</i>. (D) Percent runs survived as a function of <i>γ</i> when <i>β</i> = 100 and <i>β</i> = 75.