Chado is a relational database schema for evolutionary science. It has several key modules including sequence, cv (controlled vocabularies), phenotype, and phylogeny. The cv module stores ontologies and terminologies. The phenotype module currently uses an EAV model but may need extensions. The phylogeny module allows storing and querying of evolutionary trees, though linking phenotypes to phylogenies remains a challenge. Overall, Chado provides an extensible framework but some parts like phenotype modeling require more development.