首页
登录
职称英语
Researchers have reconstructed an ancient human genome (基因组) for the first t
Researchers have reconstructed an ancient human genome (基因组) for the first t
游客
2023-08-15
48
管理
问题
Researchers have reconstructed an ancient human genome (基因组) for the first time, thanks to the discovery of a 4000-year-old strand of hair in Greenland permafrost (永冻土). Experts say that similar techniques could be employed in many other ways, such as analyzing the DNA of South American mummies or crime victims.
The sample was taken from one of four strands of hair collected in Greenland by Danish archaeologists in the 1980s. The hairs are the only known human remains from the earliest people to settle in Greenland. A chance conversation alerted University of Copenhagen researcher Eske Willerslev, who was just back from two unsuccessful months in Greenland searching for human remains to test for DNA, to the sample, which had been stored at the National Museum of Denmark for more than 20 years.
Once they had the hairs in their possession, Willerslev and colleagues set about sequencing the sample. The team used dozens of sequencing machines to identify and map DNA fragments in the hair shafts, a process that took nearly 2 months. The data revealed more than 80% of the genome, coverage comparable to what can be done with a modern human genome.
"From the DNA, we can tell a lot about the individual," says Willerslev. "He had brown eyes, brown skin, a tendency to baldness, and dry earwax." The researchers have named him "Inuk," which means "man" or "human" in Greenlandic.
The genome also sheds light on where the man’s relatives came from. When the researchers compared his DNA with that collected from more than 40 Arctic and native North American populations, they concluded that the first people to settle in Greenland were related to groups now living in northeastern Siberia. The analysis also revealed that these first colonists were not the ancestors of the Inuit who live on the island now.
The researchers say that when it comes to ancient DNA, the Greenland sample may amount to low-hanging fruit. The hair had been preserved by cold for thousands of years, ideal conditions for recovering DNA. "Working with these young permafrost samples is worlds apart from working with older, non-permafrost samples," says Adrian Briggs, a researcher at the Max Planck Institute. He notes that the Greenland sample contains tens of thousands of times more DNA than typically found in Neandertal and early modern human samples from warmer environments.
Yet the discovery shows that with ever-cheaper genetic sequencing and faster computers, it is possible to recover a full nuclear DNA sequence from an ancient human, even when the genome is broken into tiny fragments. The nicest thing this paper shows is that the application of next-generation sequencing techniques is really going to expand what we can do with ancient DNA. [br] According to the researchers, the genetic sequencing techniques _____.
选项
A、need improving
B、are promising
C、must be computer-assisted
D、will not be limited to DNA studies
答案
B
解析
最后一段的内容强调了基因测序技术的用处,而第2句中的nicest,is really going to expand…等词都表明基因测序技术有很好的前景,因此,本题应选B。
转载请注明原文地址:https://tihaiku.com/zcyy/2929138.html
相关试题推荐
汉字蕴含古代中国人的智慧,体现中国悠久的历史。ChinesecharacterscontainthewisdomofancientChinese
造纸术是中国古代四大发明之一,是中华民族对世界文明的杰出贡献。AsoneoftheFourGreatInventionsofancientCh
茶马古道源起于云南茶叶主产区普洱市,中间经过今天的大理、丽江、西藏,最后通到尼泊尔(Nepal)和印度。TheAncientTeaHorseRoads
Whatifwecouldreadthemindofaterrorist?ResearchersatNorthwesternU
Whatifwecouldreadthemindofaterrorist?ResearchersatNorthwesternU
[originaltext]AnancientGreekphilosopheroncewrotethatlaughteriswhat
Researchershavereconstructedanancienthumangenome(基因组)forthefirstt
Researchershavereconstructedanancienthumangenome(基因组)forthefirstt
Researchershavereconstructedanancienthumangenome(基因组)forthefirstt
Researchershavereconstructedanancienthumangenome(基因组)forthefirstt
随机试题
Nowwhicharetheanimalsreallytobepitiedincaptivity?First,thosecle
PatentPatents【T1】______thechancesofinventorstomakemoneyfrom【T2】_
[originaltext]Objectsthatarevibratingmakesounds.Rhythmicsoundvibrat
WhichofthefollowingsentencesisINCORRECT?A、Iboughtthebookforwhichyou
某施工单位承接了二级公路一桥隧相连项目,其中桥梁跨布置为(65+120+65)m
下列()应计算建筑面积。(1)单层建筑内分隔单层操作间;(2)没有围护结构的
()在携带仪器前往现场途中,要防止仪器过分振动和碰撞,及时做好相应防范措
在进化的过程中,鸟嘴形成了各种不同的形状,下面是鹦鹉、鹭鸶、老鹰、金丝雀的头部画
氟牙症Dean分类的依据不包括A:饮水氟浓度 B:釉质表面的光泽 C:釉质颜
根据《建设工程施工专业分包合同(示范文本)》规定,专业工程分包人应承担违约责任的
最新回复
(
0
)