Figure 9

Distribution of fitness effect (DFE) in unevolved (black) and evolved (red) populations. Effect of (A) mutation and (B) HGT events. As populations evolve, frequency of neutral mutations increases, but frequency of neutral HGT events stays almost unaffected; in both cases frequency of lethal events is decreased in the evolved populations. Skewness and kurtosis of the distributions is shown on the top; more details can be found in Table 3. For each of four plots, statistics is collected over 8 populations evolved for 100 epochs in a XOR environment.