首页
外语
计算机
考研
公务员
职业资格
财经
工程
司法
医学
专升本
自考
实用职业技能
登录
外语
We all know that DNA has the ability to identify individuals but, because it is inherited, there are also regions of the DNA str
We all know that DNA has the ability to identify individuals but, because it is inherited, there are also regions of the DNA str
admin
2010-05-26
81
问题
We all know that DNA has the ability to identify individuals but, because it is inherited, there are also regions of the DNA strand which can relate an individual to his or her family (immediate and extended) , tribal group and even an entire population. Molecular Genealogy (宗谱学) can use this unique identification provided by the genetic markers to link people together into family trees. Pedigrees (家谱) based on such genetic markers can mean a breakthrough for family trees where information is incomplete or missing due to adoption, illegitimacy(私生)or lack of records. There are many communities and populations which have lost precious records due to tragic events such as the fire in the Irish corms during Civil War in 1921 or American slaves for whom many records were never kept in the first place.
The main objective of the Molecular Genealogy Research Group is to build a database containing over 100,000 DNA samples from individuals all over the world. These individuals will have provided a pedigree(家谱) chart of at least four generations and a small blood sample. Once the database has enough samples to represent the world genetic make-up, it will eventually help in solving many issues regarding genealogies that could not be done by relying only on traditional written records. Theoretically, any individual will someday be able to trace his or her family origins through this database.
In the meantime, as the database is being created, molecular genealogy can already verify possible or suspected relationships between individuals. "For example, if two men sharing the same last name believe that they are related, but no written record ’proves this relationship, we can verify this possibility by collecting a sample of DNA from both and looking for common markers (in this ease we can look primarily at the Y chromosome (染色体))," explains Ugo A. Perego, a member of the BYU Molecular Genealogy research team.
The possible research of family trees is based on the fact that ______.
选项
A、genetics has achieved a breakthrough
B、genetic information contained DNA can be revealed now
C、each individual carries a unique record of whom he is and how he is related to others
D、we can use DNA to prove how distant an individual is to a family, a group or a population
答案
C
解析
基于第一段第二、三句,我们知道遗传标记提供的独有的识别特征(unique identification)把人们连接在一起,形成家谱。换句话说,能对家谱进行研究,是因为遗传标记的独有特征可以用来判断一个人的基因身份以及与他人之间的关系,C项正确。A“遗传学取得突破”和B“包含在DNA中的基因信息现在可以揭示出来”没有回答进行家谱研究依据什么基础这样的问题;而D项强调“用DNA证明有多远(how distant)”与文章相悖。
转载请注明原文地址:https://kaotiyun.com/show/ynV7777K
0
大学英语四级
相关试题推荐
A、Becauseittriestoservedifferentreaders.B、Becauseithastocoverthingsthathappeninacertainlocality.C、Becauserea
A、Toprovidestudentswithachancetogettoknoweachother.B、Toinvitesuccessfulstudentsthroughuniversitytopassonsom
A、Havingabreak.B、Continuingthemeeting.C、Movingontothenextitem.D、Waitingalittlelonger.A
Agreatdealofnonsenseiswrittenaboutthecharacterofanation,chieflybecausemanyobservers,influencedbynationalprid
A、Atagasstation.B、Atahospital,C、Atabank.D、Atschool.B
MostAmericansenjoymovingfromplacetoplaceveryoften.Insomestatesonlyonehouse【C1】______fivehaspeoplelivinginit
MostAmericansenjoymovingfromplacetoplaceveryoften.Insomestatesonlyonehouse【C1】______fivehaspeoplelivinginit
Formanywomenchoosingwhethertoworkornottoworkoutsidetheirhomeisaluxury:theymustworktosurvive.Othersfacea
Toooftenyoungpeoplegetthemselvesemploymentquitebyaccident,notknowingwhatliesinthewayofopportunityforpromotio
WithinfifteenyearsBritainandothernationsshouldbewellonwiththebuildingofhugeindustrialcomplexesfortherecyclin
随机试题
慢性盆腔炎的鉴别诊断不包括:
A.起病后6~12小时升高,48小时下降,持续3~5天B.起病后12~14小时升高,下降缓慢,持续1~2周C.起病后24~72小时上升,持续7~10天D.降低程度与临床症状平行E.起病后3~4小时上升,12小时高峰,24小时下降急性胰腺炎时尿淀
A.腹膜后血肿B.尿道损伤C.神经损伤D.直肠损伤E.腹腔内脏器损伤骨盆骨折最常见和最严重的并发症是
(2009年考试真题)根据《中华人民共和国公司法》规定,股票发行价格不可以()票面金额。
某市一些食用油厂家签订合作框架合同,统一上调了食用油出厂价,该行为被反垄断主管机关依法认定为垄断。根据反垄断法律制度的规定,该垄断行为的具体类型是()。
Apoliceman
Thetechnologyofhumancloninghasarousedmuchcontroversyamongpeople.Somesupportit,whileothersobjecttoit.Asforme
Theautoindustryspendslargeamountsofmoneyonmarketingcampaigns_____youngadultcustomers.
A、Red,whiteandblue.B、Blue,black,brownandgreen.C、White,brownandblack.D、Blonde,brown,blackandred.DWhathaircolo
A、2yearsold.B、3yearsold.C、4yearsold.D、8yearsold.D选项都是岁数,这些数字可能在原文中都出现过,这就要求在听录音的同时,听到每一个数字都要在旁边做笔记。原文两次提到,直到8岁时儿童的某只
最新回复
(
0
)