Fig. 6. Asymmetry in genome size correlates strongly with asymmetry in cell-cycle efficiency between host and symbiont.

Along the ancestral lineage, genome size and cell-cycle efficiency are measured (see “Calculating cell-cycle efficiency” in “Methods”). Trajectories are shown for the experiments where the largest genome size asymmetry evolved (P1, P9 and C9–12); the trajectory of P9 is in bold. One technical replicate is shown for each of the replicates initialized with complex FECA. For the experiment initialized with primitive FECA, the size of the markers is scaled by the final population size.