Fig. 1.

The frequency of cooperation at different values of the benefit B as a function of the probabilities of social inheritance, p_n, and random linking, p_r, when these linking probabilities are kept fixed in the population. For each combination of linking probabilities, the simulation was run for 500 generations (each generation equals N death-birth events). I recorded the frequency of cooperation at intervals corresponding to N. The color in each cell depicts the average frequency of cooperation over the last 400 generations for 100 replicate simulations. Parameters are N = 100, C = 0.5, D = 0, μ = 0.001, δ = 0.1, C_link = 0