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| the basic category of biological classification, composed of individuals that resemble one another are able to breed with one another |
| any modern theory of evolution holding that species evolve by natural selection acting on genetic variation |
| cladogram (ˈkleɪdəʊˌɡræm) | |
| —n | |
| biology See clade a treelike diagram illustrating the development of a clade | |
| [C20: from | |
cladogram (klād'ə-grām', klā'də-) Pronunciation Key
(click for larger image in new window) A branching treelike diagram used to illustrate evolutionary (phylogenetic) relationships among organisms. Each node, or point of divergence, has two branching lines of descendance, indicating evolutionary divergence from a common ancestor. The endpoints of the tree represent individual species, and any node together with its descendant branches and subbranches constitutes a clade. |