GC ratios in Classical Taxonomy The same GC ratio-maybe not related Different GC ratio-surely unrelated Conclusion:Occasionally helpful but generally of minimal value Organism Prokaryotes Bacteria Archaea Eukaryotes Animals Plants Algae Fungi Protozoa 010203040506070809010- GC (mol % DNA base composition(GC%)Chen Feng, Shanghai Jiao Tong University GC ratios in Classical Taxonomy The same GC ratio-maybe not related Different GC ratio-surely unrelated Conclusion: Occasionally helpful but generally of minimal value DNA base composition(GC%)