Fig. 6

Positive selection for mutators. a frequency of a mutator phenotype in a mixed competitive population with “wild-type” species. Red (1.4X), orange (2X) and green (10X) are mutators of different fold increase in MR relative to the competitor as indicated by the respective numbers. b positive selection for a somatic cost neutral trait demonstrates faster evolution (and so adaptation) of mutators. Colors and MR fold increase as in (a)