Domain Classification Definition Biology

Archaea bacteria and eukarya.

Domain classification definition biology. In biology a domain refers to the largest of all groups in the classification of life. In biological taxonomy a domain d ə ˈ m eɪ n or d oʊ ˈ m eɪ n latin. The three domain system adds a level of classification the domains above the kingdoms present in the previously used five or six kingdom systems this classification system recognizes the fundamental divide between the two prokaryotic groups insofar as archaea appear to be more closely related to eukaryotes than they are to other prokaryotes bacteria like organisms with no cell nucleus.

Phylogeny refers to the evolutionary relationships between organisms. According to this system the tree of life consists of three domains. There are currently 3 agreed groups at this level the archaea domain bacteria domain and eukarya domain.