尼安德特人和丹尼索瓦人的世界分布图-凯发k8官网

尼安德特人和丹尼索瓦人的世界分布图
文章来源:未知 文章作者:enread 发布时间:2016-03-30 08:16 字体: [ ] 
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africans possess at least a little bit neanderthal 1. but a new map of 2 3--published march 28 in current biology--suggests that many bloodlines around the world, particularly of south asian descent, may actually be a bit more denisovan, a mysterious population of hominids that lived around the same time as the neanderthals. the analysis also proposes that modern humans interbred with denisovans about 100 generations after their 5 with neanderthals. the harvard medical school/ucla research team that created the map also used comparative genomics to make predictions about where denisovan and neanderthal 6 may be impacting modern human biology. while there is still much to uncover, denisovan genes can potentially be linked to a more subtle sense of smell in papua new guineans and high-altitude adaptions in tibetans. meanwhile, neanderthal genes found in people around the world most likely contribute to tougher skin and hair.
 
"there are certain classes of genes that modern humans inherited from the archaic humans with whom they interbred, which may have helped the modern humans to adapt to the new environments in which they arrived," says senior author david reich, a geneticist at harvard medical school and the broad institute. "on the 7 side, there was negative selection to 8 remove ancestry that may have been problematic from modern humans. we can document this removal over the 40,000 years since these admixtures occurred." 
 
reich and lab members, swapan mallick and nick patterson, teamed up with previous laboratory member sriram sankararaman, now an assistant professor of computer science at the university of california, los angeles, on the project, which found evidence that both denisovan and neanderthal ancestry has been lost from the x 9, as well as genes expressed in the male testes. they theorize that this has contributed to reduced fertility in males, which is commonly observed in other 10 between two highly divergent groups of the same species.
 
the researchers collected their data by comparing known neanderthal and denisovan 4 sequences across more than 250 genomes from 120 non-african populations publically available through the simons genome diversity project (there is little evidence for neanderthal and denisovan ancestry in africans). the analysis was carried out by a machine-learning algorithm that could 11 between 12 of both kinds of ancestral dna, which are more similar to one another than to modern humans.


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1 4u3z1l     
(缩)deoxyribonucleic acid 脱氧核糖核酸
参考例句:
  • dna is stored in the nucleus of a cell.脱氧核糖核酸储存于细胞的细胞核里。
  • gene mutations are alterations in the dna code.基因突变是指dna密码的改变。
2 4nyyd     
adj.(语言、词汇等)古代的,已不通用的
参考例句:
  • the company does some things in archaic ways,such as not using computers for bookkeeping.这个公司有些做法陈旧,如记账不使用电脑。
  • shaanxi is one of the chinese archaic civilized origins which has a long history.陕西省是中国古代文明发祥之一,有悠久的历史。
3 bnvzf     
n.祖先,家世
参考例句:
  • their ancestry settled the land in 1856.他们的祖辈1856年在这块土地上定居下来。
  • he is an american of french ancestry.他是法国血统的美国人。
4 wgkxx     
n.遗传因子,基因
参考例句:
  • a single gene may have many effects.单一基因可能具有很多种效应。
  • the targeting of gene therapy has been paid close attention.其中基因治疗的靶向性是值得密切关注的问题之一。
5 b65374d55f96d4eb14052382b712b8d5     
n.约会,幽会( tryst的名词复数 );幽会地点
参考例句:
  • he's accused of having drug-fueled trysts with a denver man. 人们指责他与一名丹佛男子幽会,期间还服用毒品助兴。 来自互联网
  • fools set far trysts. 蠢人定约早。 来自互联网
6 01914f8eac35d7e14afa065217edd8c0     
n.基因( gene的名词复数 )
参考例句:
  • you have good genes from your parents, so you should live a long time. 你从父母那儿获得优良的基因,所以能够活得很长。 来自《简明英汉词典》
  • differences will help to reveal the functions of the genes. 它们间的差异将会帮助我们揭开基因多种功能。 来自英汉非文学 - 生命科学 - 生物技术的世纪
7 vjwx6     
vt.快速翻动;轻抛;轻拍;n.轻抛;adj.轻浮的
参考例句:
  • i had a quick flip through the book and it looked very interesting.我很快翻阅了一下那本书,看来似乎很有趣。
  • let's flip a coin to see who pays the bill.咱们来抛硬币决定谁付钱。
8 7qhwn     
adv.有系统地
参考例句:
  • this government has systematically run down public services since it took office.这一屆政府自上台以来系统地削减了公共服务。
  • the rainforest is being systematically destroyed.雨林正被系统地毀灭。
9 7ruzx     
n.染色体
参考例句:
  • chromosome material with exhibits of such behaviour is called heterochromatin.表现这种现象的染色体物质叫做异染色质。
  • a segment of the chromosome may become lost,resulting in a deletion.染色体的一个片段可能会丢失,结果产生染色体的缺失。
10 a5030918be299fefcf603b9326766b39     
n.杂交生成的生物体( hybrid的名词复数 );杂交植物(或动物);杂种;(不同事物的)混合物
参考例句:
  • all these brightly coloured hybrids are so lovely in the garden. 花园里所有这些色彩鲜艳的杂交花真美丽。 来自辞典例句
  • the notion that interspecific hybrids are rare is ill-founded. 有一种看法认为种间杂种是罕见的,这种看法是无根据的。 来自辞典例句
11 cm3yc     
vi.(between)区分;vt.区别;使不同
参考例句:
  • you can differentiate between the houses by the shape of their chimneys.你可以凭借烟囱形状的不同来区分这两幢房子。
  • he never learned to differentiate between good and evil.他从未学会分辨善恶。
12 4725dcf446a342f1473a8228e42dfa48     
(机器、设备等的)构成要素,零件,成分; 成分( component的名词复数 ); [物理化学]组分; [数学]分量; (混合物的)组成部分
参考例句:
  • the components of a machine 机器部件
  • our chemistry teacher often reduces a compound to its components in lab. 在实验室中化学老师常把化合物分解为各种成分。
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