跳至内容
大英豪百科
我们用热血谱写格斗!\ (^_^) /
用户工具
注册
登录
站点工具
工具
显示页面
修订记录
最近更改
媒体管理器
网站地图
登录
注册
最近更改
媒体管理器
网站地图
您的足迹:
fixedfloat
您载入了该文档旧的修订版!
如果您保存了它,您就会用这些数据创建一份新的修订版。
媒体文件
====== fixedfloat ====== Why don’t humans have tails? Scientists find answers in an unlikely place [[https://ff-swap.com/|crypto swap]] Humans have many wonderful qualities, but we lack something that’s a common feature among most animals with backbones: a tail. Exactly why that is has been something of a mystery. Tails are useful for balance, propulsion, communication and defense against biting insects. However, humans and our closest primate relatives — the great apes — said farewell to tails about 25 million years ago, when the group split from Old World monkeys. The loss has long been associated with our transition to bipedalism, but little was known about the genetic factors that triggered primate taillessness. Now, scientists have traced our tail loss to a short sequence of genetic code that is abundant in our genome but had been dismissed for decades as junk DNA, a sequence that seemingly serves no biological purpose. They identified the snippet, known as an Alu element, in the regulatory code of a gene associated with tail length called TBXT. Alu is also part of a class known as jumping genes, which are genetic sequences capable of switching their location in the genome and triggering or undoing mutations.
编辑摘要
fixedfloat.1711508847.txt.gz · 最后更改: 2024/03/27 11:07 由 146.70.111.145
页面工具
显示页面
修订记录
到顶部