| 单词 | orthogenesis |
| 释义 | orthogenesis /awr'theuh jen"euh sis/, n. 1. Biol. a. Also called orthoselection. evolution of a species proceeding by continuous structural changes in a single lineage without presenting a branching pattern of descent. b. a theory that the evolution of a species in a continuous, nonbranching manner is due to a predetermined series of alterations intrinsic to the species and not subject to natural selection. 2. Sociol. a hypothetical parallelism between the stages through which every culture necessarily passes, in spite of secondary conditioning factors. [1890-95; < NL; see ORTHO-, GENESIS] |
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