Figure 1From: The evolution of competition and policing: opposing selection within and among groupsEquilibrium frequency (q*) of a 'competitive' allele. q* as a function of the base-line level of competition (z0) and the additive effect of the competitive allele (za). The equilibrium frequency, q* varies continuously from fixed to lost. Lines mark a change in q* of 0.2, and are labeled by numbers to their right.Back to article page