|
151. |
Transition between neo-Darwinian and non-Darwinian evolution |
|
AIP Conference Proceedings,
Volume 519,
Issue 1,
1900,
Page 772-781
Hirotsugu Matsuda,
Preview
|
PDF (525KB)
|
|
摘要:
Controversies have continued as to the range of applicability of neo-Darwinian and non-Darwinian view of evolution, since Kimura proposed the neutral theory of molecular evolution. By the former view evolution rate v is regulated by environment independent of mutation rate m, whereas by the latter view it is regulated by mutation independent of environment change rate. To understand the population genetical conditions for demarcating the two views, inducibility&khgr;=&dgr;v/&dgr;&mgr;of evolution rate is studied for simple dynamical model and Markovian model. For neo-Darwinian evolution the inducibility is almost 0, whereas for non-Darwinian evolution it is significantly positive. Among non-Darwinian evolution, the inducibility is nearly equal to 1 for neutral evolution. The critical selection intensitysCdemarcating neo-Darwinian and non-Darwinian evolution is obtained. There exists another demarcation selection intensitysC−such that in the range(sC−,sC)the evolution is non-Darwinian but not neutral. This transition region corresponds to Ohta’s nearly neutral evolution. Estimating its relative widthsC−/sC,it is argued that so long as the effect of selection is significant for polymorphism, neo-Darwinian evolution will be more frequent in nature than the nearly neutral evolution. ©2000 American Institute of Physics.
ISSN:0094-243X
DOI:10.1063/1.1291666
出版商:AIP
年代:1900
数据来源: AIP
|
152. |
Multilingual environment and natural acquisition of language |
|
AIP Conference Proceedings,
Volume 519,
Issue 1,
1900,
Page 785-796
Shunichi Takano,
Shigeru Nakamura,
Preview
|
PDF (874KB)
|
|
摘要:
Language and human are not anything in the outside of nature. Not only babies, even adults can acquire new language naturally, if they have a natural multilingual environment around them. The reason it is possible would be that any human has an ability to grasp the whole of language, and at the same time, language has an order which is the easiest to acquire for humans. The process of this natural acquisition and a result of investigating the order of Japanese vowels are introduced. ©2000 American Institute of Physics.
ISSN:0094-243X
DOI:10.1063/1.1291667
出版商:AIP
年代:1900
数据来源: AIP
|
|