克洛维人基因组绘制完毕
文章来源:未知 文章作者:enread 发布时间:2014-02-13 05:18 字体: [ ]  进入论坛
(单词翻译:双击或拖选)
They lived in America about 13,000 years ago where they hunted mammoth1(猛犸象), mastodons(乳齿象) and giant bison with big spears. The Clovis people were not the first humans in America, but they represent the first humans with a wide expansion on the North American continent -- until the culture mysteriously disappeared only a few hundred years after its origin. Who the Clovis people were and which present day humans they are related to has been discussed intensely and the issue has a key role in the discussion about how the Americas were peopled.
 
Today there exists only one human skeleton found in association with Clovis tools and at the same time it is among the oldest human skeletons in the Americas. It is a small boy between 1 and 1.5 years of age -- found in a 12,600 old burial site, called the Anzick Site, in Wilsall, Montana, USA. Now an international team headed by Danish researcher Eske Willerslev has mapped his genome thereby2 reviving the scientific debate about the colonization3 of the Americas. Roughly estimated some 80 % of all present-day Native American populations on the two American continents are direct descendants of the Clovis boy's family. The remaining 20 % are more closely related with the Clovis family than any other people on Earth, says Lundbeck Professor Eske Willerslev from the Centre for GeoGenetics at the Natural History Museum of Denmark, University of Copenhagen.
 
This surprising result has now been published in the scientific journal Nature. The discovery is so decisive that Nature has chosen to send the article to the press at a later time than usual as they fear the media embargo6 may be broken. A comprehensive international telephone press conference has been arranged and will be held in the Crow tribe's reservation in Montana -- close to where the boy was found. Behind the results are a group of international researchers led by Professor Eske Willerslev from Centre of Excellence7 in GeoGenetics, Natural History Museum at University of Copenhagen, Denmark.

The missing link
 
It is almost like finding the 'missing link' to the common ancestor of the Native Americans. The Clovis boy's family is the direct ancestor to roughly estimated 80 % of all present day Native Americans. Although the Clovis culture disappeared its people are living today. Put simply it is a sensation that we succeeded in finding an approximately 12,600 year old boy whose closest relatives can be regarded as the direct ancestor to so many people, Eske Willerslev says and adds: This also means that Clovis did not descend4 from Europeans, Asians or Melanesians, a theory that a number of scientists have advocated. They were Native Americans -- and the Native American ancestors were the first people in America. This is now a fact.
 
Shane Doyle, a historian from the Apsaalooke (Crow) tribe, who helped the team with consultations8 to the Montana tribes agrees: This discovery by Eske and his team proves something that tribal9 people have never doubted -- we've been here since time immemorial(太古时代) and all the ancient artifacts located within our homelands are remnants from our direct ancestors. But the discovery is only part of the importance of this study. The other part being Eske and his team's respectful commitment to interacting face to face with tribal communities and listening to Native American leaders, which has lead directly to the reburial of this little boy."
 
Also Sarah Anzick, a molecular10 biologist in the study and the steward11 of the remains12 that were found on private land is excited: After 46 years since the discovery on my family land, we are finally hearing this child's story through his genetic5 legacy13. I find it remarkable14 that the descendants of the Clovis culture, which seemed to have vanished 12,600 years ago, are still alive and thriving today.
 
Interestingly, the teams find that Native American ancestors coming in from Siberia split into two groups. One group is ancestors to the Native Americans presently living in Canada and the other one -- which is represented by the Clovis boy -- is the ancestor to virtually all Native Americans in South America and Mexico. The US is still a white spot on the map when it comes to genome-wide data from Native Americans. The team members hope to be able to accessing such data in the future to understand the full picture.
 
The study validates15 the concept of continuity in the history of Native Americans, and suggests that modern Native Americans are direct descendants of the first people occupying this land, says Rasmus Nielsen, a co-author on the study and a Professor at UC Berkeley, who developed the method used for determining that many modern native Americans are direct descendants of the Clovis boy's family.


点击收听单词发音收听单词发音  

1 mammoth u2wy8     
n.长毛象;adj.长毛象似的,巨大的
参考例句:
  • You can only undertake mammoth changes if the finances are there.资金到位的情况下方可进行重大变革。
  • Building the new railroad will be a mammoth job.修建那条新铁路将是一项巨大工程。
2 thereby Sokwv     
adv.因此,从而
参考例句:
  • I have never been to that city,,ereby I don't know much about it.我从未去过那座城市,因此对它不怎么熟悉。
  • He became a British citizen,thereby gaining the right to vote.他成了英国公民,因而得到了投票权。
3 colonization fa0db2e0e94efd7127e1e573e71196df     
殖民地的开拓,殖民,殖民地化; 移殖
参考例句:
  • Colonization took place during the Habsburg dynasty. 开拓殖民地在哈布斯堡王朝就进行过。
  • These countries took part in the colonization of Africa. 这些国家参与非洲殖民地的开发。
4 descend descend     
vt./vi.传下来,下来,下降
参考例句:
  • I hope the grace of God would descend on me.我期望上帝的恩惠。
  • We're not going to descend to such methods.我们不会沦落到使用这种手段。
5 genetic PgIxp     
adj.遗传的,遗传学的
参考例句:
  • It's very difficult to treat genetic diseases.遗传性疾病治疗起来很困难。
  • Each daughter cell can receive a full complement of the genetic information.每个子细胞可以收到遗传信息的一个完全补偿物。
6 embargo OqixW     
n.禁运(令);vt.对...实行禁运,禁止(通商)
参考例句:
  • This country put an oil embargo on an enemy country.该国对敌国实行石油禁运。
  • During the war,they laid an embargo on commerce with enemy countries.在战争期间,他们禁止与敌国通商。
7 excellence ZnhxM     
n.优秀,杰出,(pl.)优点,美德
参考例句:
  • His art has reached a high degree of excellence.他的艺术已达到炉火纯青的地步。
  • My performance is far below excellence.我的表演离优秀还差得远呢。
8 consultations bc61566a804b15898d05aff1e97f0341     
n.磋商(会议)( consultation的名词复数 );商讨会;协商会;查找
参考例句:
  • Consultations can be arranged at other times by appointment. 磋商可以通过预约安排在其他时间。 来自《现代汉英综合大词典》
  • Consultations are under way. 正在进行磋商。 来自《现代汉英综合大词典》
9 tribal ifwzzw     
adj.部族的,种族的
参考例句:
  • He became skilled in several tribal lingoes.他精通几种部族的语言。
  • The country was torn apart by fierce tribal hostilities.那个国家被部落间的激烈冲突弄得四分五裂。
10 molecular mE9xh     
adj.分子的;克分子的
参考例句:
  • The research will provide direct insight into molecular mechanisms.这项研究将使人能够直接地了解分子的机理。
  • For the pressure to become zero, molecular bombardment must cease.当压强趋近于零时,分子的碰撞就停止了。
11 steward uUtzw     
n.乘务员,服务员;看管人;膳食管理员
参考例句:
  • He's the steward of the club.他是这家俱乐部的管理员。
  • He went around the world as a ship's steward.他当客船服务员,到过世界各地。
12 remains 1kMzTy     
n.剩余物,残留物;遗体,遗迹
参考例句:
  • He ate the remains of food hungrily.他狼吞虎咽地吃剩余的食物。
  • The remains of the meal were fed to the dog.残羹剩饭喂狗了。
13 legacy 59YzD     
n.遗产,遗赠;先人(或过去)留下的东西
参考例句:
  • They are the most precious cultural legacy our forefathers left.它们是我们祖先留下来的最宝贵的文化遗产。
  • He thinks the legacy is a gift from the Gods.他认为这笔遗产是天赐之物。
14 remarkable 8Vbx6     
adj.显著的,异常的,非凡的,值得注意的
参考例句:
  • She has made remarkable headway in her writing skills.她在写作技巧方面有了长足进步。
  • These cars are remarkable for the quietness of their engines.这些汽车因发动机没有噪音而不同凡响。
15 validates d28f3305a883e5207d6097da0b7642f0     
v.证实( validate的第三人称单数 );确证;使生效;使有法律效力
参考例句:
  • Other research validates that when it comes to chocolate, type does matter. 其他的研究也证实了不同种类的巧克力确实功效不同。 来自互联网
  • Trouble shoots equipment, review and validates data and complete reports. 管理错误描述设备,审查并确认试验数据,完成试验报告。 来自互联网
TAG标签: human skeleton Clovis
发表评论
请自觉遵守互联网相关的政策法规,严禁发布色情、暴力、反动的言论。
评价:
表情:
验证码:点击我更换图片