Provides a molecular phylogeny-based perspective on microbial diversity and the interactions between organisms that result in the biosphere. Provides overview of recent methods and findings in microbial ecology, as well as computer-based workshop in molecular phylogeny. Prereqs., CHEM 1133 or 1371, general biology, or instructor consent. Recommended prereqs., EBIO 3400 and/or CHEM 3311. Same as MCDB 5350.