图 书 馆
在进化过程中的重大转变The Major Transitions in Evolution |
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| 课程网址: | http://videolectures.net/bzid09_szathmary_vpve/ |
| 主讲教师: | Eörs Szathmáry |
| 开课单位: | 埃特沃斯洛兰德大学 |
| 开课时间: | 2009-11-09 |
| 课程语种: | 英语 |
| 中文简介: |  |
| 课程简介: | Some major transitions in evolution (such as the origin of multicellular organisms or that of social animals) occurred a number of times, whereas others (the origin of the genetic code, or language) seem to have been unique events. One must be cautious with the word ‘unique’, however. Due to a lack of the ‘true’ phylogeny of all extinct and extant organisms, one can give it only an operational definition. If all the extant and fossil species, which possess traits arising from a particular transition, share a last common ancestor after that transition, then the transition is said to be unique. Obviously, it is quite possible that there had been independent “trials”, as it were, but we do not have comparative or fossil evidence for them. |
| 关 键 词: | 进化; 转变; 生物 |
| 课程来源: | 视频讲座网 |
| 最后编审: | 2020-07-16：yumf |
| 阅读次数: | 63 |