Many microbial species have short generation times, easily sequenced genomes, and well-understood biology. They are therefore commonly used for experimental evolution studies. The bacterial species most commonly used for experimental evolution include P. fluorescens, Pseudomonas aeruginosa, Enterococcus faecalis and E. coli (see below), while the Yeast S. cerevisiae has been used as a model for the study of eukaryotic evolution.
