|
- 积分
- 17983
- 威望
- 17983
- 包包
- 26159
|
本帖最后由 细胞海洋 于 2012-10-6 13:58 编辑
* T& W5 J2 m' q4 L" S( B
$ q* n2 t. N0 b! ^- U1 J' J
6 F: N' t+ ]! w$ r: I' M6 _0 VAs it develops from a single-celled zygote to a mature plant embryo, the thale cress Arabidopsis thaliana passes through a stage during which phylogenetically very ancient genes are preferentially expressed. This corroborates recent work on animals demonstrating a similar period of embryogenesis that coincides with what nineteenth-century zoologists recognized as a phase in development — at least in vertebrates — in which embryos of all species looked very similar. It seems that animals and plants have independently converged on a similar way of managing gene expression as they transform from a single-celled zygote to a multicellular organism, even though their morphological development is very different. Cover art by www.sistersofdesign.de " q0 V% t! l& U& M
; _ A) j. u( R9 v, p! t1 r
6 ]; s& v8 e. C, f[hide][/hide] |
附件: 你需要登录才可以下载或查看附件。没有帐号？注册
-
总评分: 威望 + 20
包包 + 20
查看全部评分
|
发表于 2012-10-5 12:23
发表于 2012-10-8 15:15
