首页
登录
职称英语
Researchers have reconstructed an ancient human genome(基因组)for the first tim
Researchers have reconstructed an ancient human genome(基因组)for the first tim
游客
2024-04-05
18
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 modem 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 modem 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/3542131.html
相关试题推荐
[originaltext]AnancientGreekphilosopheroncewrotethatlaughteriswhat
Researchershavereconstructedanancienthumangenome(基因组)forthefirsttim
Researchershavereconstructedanancienthumangenome(基因组)forthefirsttim
Researchershavereconstructedanancienthumangenome(基因组)forthefirsttim
Inlastyear’sSciencestudy,researchersatJohnsHopkinsUniversityexami
Inlastyear’sSciencestudy,researchersatJohnsHopkinsUniversityexami
Inlastyear’sSciencestudy,researchersatJohnsHopkinsUniversityexami
Inlastyear’sSciencestudy,researchersatJohnsHopkinsUniversityexami
Inlastyear’sSciencestudy,researchersatJohnsHopkinsUniversityexami
Inlastyear’sSciencestudy,researchersatJohnsHopkinsUniversityexami
随机试题
We_____lastnight,butwewenttotheconcertinstead.A、musthavestudiedB、migh
Organicfarmershadfoughttopreventgenetically-engineeredcropsfrombein
Nowletuslookathowweread.Whenwereadaprintedtext,oureyesmove
What%theword"saying"(Line1,Para1)inthispassagemean?[br]Whatisextre
(2020年真题)企业计划筹措资金进行固定资产升级改造。筹措方案分别为增发股票、
商业银行下列金融创新行为中,符合客户利益保护原则的是( )。A.损害客户利益不
四环素类抗生素能和金属离子形成红色配位化合物的依据为A.分子结构中具有二甲氨基B
我国宪法规定,公民享有的政治权利和自由包括()。 A.言论自由B.平等权
胆固醇在体内的主要生理功能是A.影响基因表达 B.合成磷脂的前体 C.控制胆
根据《建设工程安全生产管理条例》,施工现场及毗邻区域内供水、排水、供电、供气、供
最新回复
(
0
)