This book explains the role of simple biological model systems in the growth of molecular biology. Essentially the whole history of molecular biology is presented here, tracing the work in bacteriophages in E. coli, the role of other prokaryotic systems, and also the protozoan and algal models - Paramecium and Chlamydomonas, primarily - and the move into eukaryotes with the fungal systems - Neurospora, Aspergillus and yeast. Each model was selected...