Fig. 7
From: In silico evo-devo: reconstructing stages in the evolution of animal segmentation
The order of evolutionary events differs between simulations with and without selection for axial extension (persistent signal, no CCS). Graphs depict the evolution of final tissue size and segment number for one simulation. Left column sequential segmentation, right simultaneous segmentation. The colour of the nodes indicates the evolutionary time point. a Evolutionary trajectories when selecting for axial extension and segmentation: tissue size evolves first to target size before segmentation evolves. b Only selection for segments. For sequential segmentation, growth happens in phases. First the available tissue evolves to be filled with segments before tissue size increases further. For simultaneous segmentation, tissue size and number of segments evolve concurrently, but the process is noisy. Note the increased robustness towards the end of the simulation