Fig. 8

The time of onset of selection for stopping growth influences evolutionary outcome (persistent signal, no CCS). a The frequency with which simulations evolve simultaneous segmentation increases with stronger selection pressures to stop growing. Only rarely do individuals evolve with determinate sequential segmentation. b When the selection pressure to stop growing is added after segmentation has evolved, sequential segmentation with determinate growth more frequently evolves. The number of simulations which switch to simultaneous growth does still increase with increasing selection pressure. Twenty sequentially growing individuals were allowed to continue evolution with the added pressure. The selection pressure required to effect a change is higher; the period over which divisions are penalised is now also 40 steps instead of 20