| 释义 |
orthoselection, n. Biol.|ˌɔːθəʊsɪˈlɛkʃən|
[a. G. Orthoselection (L. Plate, 1903, in Über die Bedeutung d. Darwin'schen Selectionsprincips iv. 187): cf. ortho-, selection n.]
Natural selection occurring in the same direction continuously over a relatively long period, and giving rise to orthogenesis.
1907V. L. Kellogg Darwinism To-day x. 276 To attribute orthogenetic results to natural selection is quite right, and some one has proposed the name orthoselection to distinguish orthogenetic evolution as produced by selection from such results produced independently, or at least partly independently of selection. 1944G. G. Simpson Tempo & Mode in Evolution v. 150 Plate supposed orthevolution to be due to two quite different causes, orthogenesis..and orthoselection, a term that is self-explanatory and has been rather widely employed, although hardly more respectable etymologically than ‘orthevolution’. 1966G. C. Williams Adaptation & Natural Selection iv. 111 Other examples are apparently real and are attributed by Simpson to continuous genic selection in certain directions, a process he terms ‘orthoselection’. 1977D. M. Raup in A. Hallam Patterns of Evolution iii. 65 Hayami and Ozawa interpreted both examples as showing unidirectional, genetic change resulting from a single cause (orthoselection). 1986Oxf. Surveys in Evol. Biol. III. 12 The concept of punctuated equilibrium was developed explicitly in contrast to phyletic gradualism equated with orthoselection. |