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
2024-04-07
47
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] What do we know about "Inuk"?
选项
A、It signifies where the ancient man was found.
B、It represents where the ancient man was born.
C、It comes from a language spoken in Greenland.
D、It describes the ancient man’s physical features.
答案
C
解析
原文该句末尾的定语从句表明了“Inuk”这个名字的命名原因,其中的in Greenlandic表明Greenlandic应为一个名词,根据从句的结构可以推断Greenlandic最可能是“格陵兰语”的意思,因此,本题应选C。
转载请注明原文地址:https://tihaiku.com/zcyy/3545395.html
相关试题推荐
Researchershavereconstructedanancienthumangenome(基因组)forthefirstt
Researchershavereconstructedanancienthumangenome(基因组)forthefirstt
Researchershavereconstructedanancienthumangenome(基因组)forthefirstt
TheancientGreeksdevelopedbasicmemorysystemscalledMnemonics.Thename
TheancientGreeksdevelopedbasicmemorysystemscalledMnemonics.Thename
TheancientGreeksdevelopedbasicmemorysystemscalledMnemonics.Thename
TheancientGreeksdevelopedbasicmemorysystemscalledMnemonics.Thename
TheancientGreeksdevelopedbasicmemorysystemscalledMnemonics.Thename
汉字蕴含古代中国人的智慧,体现中国悠久的历史。ChinesecharacterscontainthewisdomofancientChinese
茶马古道(theAncientTeaHomeR0ad)是中国西南地区一条重要的商贸通道,兴起于唐宋时期。兴盛于明清时期。它源起于云南茶叶主产区普
随机试题
BorninNorthCarolinain1862,WilliamSidneyPorter,thismasterofshort
OntheImportanceofBeingOptimisticDirections:Forthispart,youare
32岁女性,孕3产1,人流后4个月,无月经来潮,近2个月周期性腹痛。查:子宫稍大
阅读下列材料,回答问题。 材料一 康熙帝说:“今天下大小事务,皆朕一人亲理,
高等学校的教师的聘任,应当遵循()的原则,由高等学校的校长与受聘教师签
贷款本息全部还清后,相关部门应对贷款项目和信贷工作进行全面的总结。相关部门应在贷
一住店客人未付房钱即想离开旅馆去车站。旅馆服务员揪住他不让走,并打报警电话。客人
在初步评审中,核查已标价的工程量清单时,下列说法错误的是()。A.如果有计
黄体功能不足的临床特征是A.经期延长达9~10天,出血量多,周期正常 B.月经
“医乃仁术”是指 A.道德是医学的本质特征 B.道德是医学活动中的一般现象C
最新回复
(
0
)