| 释义 |
orthogenesis Biol.|ɔːθəʊˈdʒɛnɪsɪs|
[a. G. orthogenesis (W. Haacke Gestaltung und Vererbung (1893) ii. 31), f. ortho- + -genesis.]
A series of similar variations in successive generations, leading to evolutionary change produced by these mutations. Also orthogeˈnetics n. pl.
1895Nature 3 Oct. 554/2 Prof. Eimer, of Tübingen, spoke..on the subject of orthogenesis. 1897Jrnl. R. Microsc. Soc. 108 The causes of orthogenesis are to be found in the action of environment upon the constitution of the organism. 1911Encycl. Brit. XXVII. 912/1 Many successful series,..as they have survived, must inevitably display orthogenesis to some extent. 1930G. R. de Beer Embryol. & Evolution iv. 32 This incorrigible tendency to produce larger and larger horns, to vary continuously in the same direction, has been given the name of orthogenesis. 1937A. Huxley Ends & Means xiv. 261 Neither Lamarckism nor the orthogenetics theory seems to be compatible with the fact that most mutations are demonstrably deleterious. 1956Nature 18 Feb. 309/1 His [sc. Arthur Trueman's] contributions to the more philosophical aspects of palæontology ranged..from lineage and orthogenesis, to a reconsideration of the species concept. 1965R. Howard tr. de Beauvoir's Force of Circumstance x. 500 They talked, not about birth control but about the joys of maternity, not about contraception but about orthogenesis. 1970Watsonia VIII. 178 A telling argument in favour of mutation pressure (orthogenesis) rather than natural selection. 1973Nature 10 Aug. 375/1 A non-Darwinian orthogenesis had sealed the fate of Megaloceros under the oppressive weight of its own enlarging antlers. |