cenogenesis
n . 新生性变异
新生性变异
cenogenesis n 1 :
introduction during embryonic development of characters or structure not present in the earlier evolutionary history of the strain or species (
such as the addition of the placenta in mammalian evolution ) [
synonym : {
cenogenesis },
{
kenogenesis }, {
caenogenesis }, {
cainogenesis },
{
kainogenesis }] [
ant : {
palingenesis }, {
recapitulation }]
Kenogenesis \
Ken `
o *
gen "
e *
sis \,
n . [
Gr . ?
new E .
genesis .]
(
Biol .)
Modified evolution ,
in which nonprimitive characters make their appearance in consequence of a secondary adaptation of the embryo to the peculiar conditions of its environment ; --
distinguished from {
palingenesis }. [
Written also {
cenogenesis }
and {
c [
ae ]
nogenesis }.]
[
1913 Webster ]
Recapitulation \
Re `
ca *
pit `
u *
la "
tion \
(
r [=
e ]`
k [.
a ]*
p [
i ^]
t "[-
u ]*
l [=
a ]"
sh [
u ^]
n ),
n . [
LL .
recapitulatio :
cf .
F .
recapitulation .]
1 .
The act of recapitulating ;
a summary ,
or concise statement or enumeration ,
of the principal points ,
facts ,
or statements ,
in a preceding discourse ,
argument ,
or essay .
[
1913 Webster ]
2 . (
Zool .)
That process of development of the individual organism from the embryonic stage onward ,
which displays a parallel between the development of an individual animal (
ontogeny )
and the historical evolution of the species (
phylogeny ).
Some authors recognize two types of recapitulation , {
palingenesis },
in which the truly ancestral characters conserved by heredity are reproduced during development ;
and {
cenogenesis } ({
kenogenesis }
or {
coenogenesis }),
the mode of individual development in which alterations in the development process have changed the original process of recapitulation and obscured the evolutionary pathway .
[
PJC ]
This parallel is explained by the theory of evolution ,
according to which ,
in the words of Sidgwick , "
the developmental history of the individual appears to be a short and simplified repetition ,
or in a certain sense a recapitulation ,
of the course of development of the species ."
Examples of recapitulation may be found in the embryological development of all vertebrates .
Thus the frog develops through stages in which the embryo just before hatching is very fish -
like ,
after hatching becomes a tadpole which exhibits many newt -
like characters ;
and finally reaches the permanent frog stage .
This accords with the comparative rank of the fish ,
newt and frog groups in classification ;
and also with the succession appearance of these groups .
Man ,
as the highest animal ,
exhibits most completely these phenomena .
In the earliest stages the human embryo is indistinguishable from that of any other creature .
A little later the cephalic region shows gill -
slits ,
like those which in a shark are a permanent feature ,
and the heart is two -
chambered or fish -
like .
Further development closes the gill -
slits ,
and the heart changes to the reptilian type .
Here the reptiles stop ,
while birds and mammals advance further ;
but the human embryo in its progress to the higher type recapitulates and leaves features characteristic of lower mammalian forms --
for instance ,
a distinct and comparatively long tail exists .
Most of these changes are completed before the embryo is six weeks old ,
but some traces of primitive and obsolete structures persist throughout life as "
vestiges "
or "
rudimentary organs ,"
and others appear after birth in infancy ,
as the well -
known tendency of babies to turn their feet sideways and inward ,
and to use their toes and feet as grasping organs ,
after the manner of monkeys .
This recapitulation of ancestral characters in ontogeny is not complete ,
however ,
for not all the stages are reproduced in every case ,
so far as can be perceived ;
and it is irregular and complicated in various ways among others by the inheritance of acquired characters .
The most special students of it ,
as Haeckel ,
Fritz M ["
u ]
tter ,
Hyatt ,
Balfour ,
etc .,
distinguish two sorts of recapitulation {
palingenesis },
exemplified in amphibian larvae and {
coenogenesis },
the last manifested most completely in the metamorphoses of insects .
Palingenesis is recapitulation without any fundamental changes due to the later modification of the primitive method of development ,
while in coenogenesis ,
the mode of development has suffered alterations which obscure the original process of recapitulation ,
or support it entirely .
--
Encyclopedia Americana ,
1961 .
[
PJC ]
cenogenesis \
cen `
o *
gen "
e *
sis \
n . [
Gr . ?
new E .
genesis .]
(
Biol .)
The introduction during embryonic development of characters or structure not present in the earlier evolutionary history of the strain or species (
as addition of the placenta in mammalian evolution );
a modified evolution ,
in which nonprimitive characters make their appearance in consequence of a secondary adaptation of the embryo to the peculiar conditions of its environment ; --
distinguished from {
palingenesis }. [
Also spelled {
caenogenesis }
and formerly {
kenogenesis }.]
[
WordNet 1 .
5 1913 Webster ]
安装中文字典英文字典查询工具!
中文字典英文字典工具:
复制到剪贴板
英文字典中文字典相关资料:
Node. js — 下载 Node. js® 提示 Want new features sooner? Get the latest Node js version instead and try the latest improvements! 提示 涉及社区软件的安装方法由维护该软件的团队提供支持。
Node. js 下载安装与环境配置全流程(保姆级详解)| 图文详解,快速上手_node安装教程图文详解-CSDN博客 本文是我在学习 Node js 过程中整理的笔记,详细记录了 Node js 的下载安装、环境配置、全局模块安装、镜像加速设置等操作步骤。 虽然是学习笔记,但内容非常全面、细致,适合初学者和有需要的朋友参考。 _node安装教程图文详解
【2026 最新版】Node. js安装及环境配置超详细教程(以win11为例子) 权限报错:全局安装模块时经常报 EACCES 错误。 今天这篇教程,我将基于 Windows 11 系统,手把手带大家完成 Node js 的下载、安装、 环境变量 配置以及淘宝镜像加速。 教程经过我 2026 年 1 月亲测,绝对稳健! 🛠️ 第一步:下载 Node js
Node. js 安装配置 - 菜鸟教程 Node js 安装配置 本章节我们将向大家介绍在 Windows、Linux 和 macOS 上安装 Node js 的方法。 Node js 安装包及源码下载地址为: https: nodejs org en download。 Package Manager: 使用系统自带的包管理工具(如 apt 、 yum 、 brew)安装。 自动管理依赖和更新,适合命令行用户。
Node. js 安装与环境配置-腾讯云开发者社区-腾讯云 Node js安装与配置全指南:从下载到优化环境。 推荐LTS稳定版,详解Windows安装步骤,验证安装方法。 优化全局包路径避免C盘爆满,配置国内镜像源提速10倍+。 解决常见问题如版本管理、权限错误,提供进阶技巧。 适合开发者快速搭建高效Node js开发环境。
下载 | Node. js 中文网 长期支持版本 25 8 1 最新版本 Windows 安装包 node-v24 14 0-x64 msi macOS 安装包 node-v24 14 0 pkg 源代码 node-v24 14 0 tar gz - 其他优质中文网 - Anime Shadcn Vue
Download Node. js® # Download and install Chocolatey: powershell -c "irm https: community chocolatey org install ps1|iex" # Download and install Node js: choco install nodejs --version="24 14 1" # Verify the Node js version: node -v # Should print "v24 14 1"
全网最详细的 Node. js 卸载和安装教程 - CSDN博客 文章浏览阅读320次,点赞4次,收藏7次。通过本教程,您可以快速掌握如何卸载和安装 Node js。在安装完 Node js 后,也可以配置常用的cnpmyarn等工具,以便更快地管理依赖包。在 Windows、macOS、Linux 等不同系统上的安装流程大同小异,使用 NVM 可以让你方便地管理 Node js 的多个版本。
Node. js和npm本地安装详细教程(全系统适配) Node js和npm本地安装详细教程(全系统适配) 说明:npm(Node Package Manager) 是Node js的自带包管理工具,安装Node js后会自动安装对应版本的npm,无需单独下载。本教程适配Windows、Mac、Linux 三大主流系统,步骤详细且标注关键注意事项,新手可直接跟随操作,全程使用官方渠道,安全无第三方风险。 一
【2026 最新版】Node. js安装及环境配置超详细教程(以win11为例子)_windows下nodejs安装及环境配置-CSDN博客 本文详细介绍了Windows11系统下Node js的安装与优化配置指南。 教程包含七个关键步骤:从官网下载LTS版本、自定义安装路径避开C盘、验证安装、核心环境配置(迁移全局包和缓存目录)、配置淘宝镜像源加速下载、修改文件夹权限避免报错,以及最终测试验证。