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
31
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.
People in a large area may possess the same DNA thread because?
选项
A、DNA is characteristic of a region.
B、they are beyond doubt of common ancestry.
C、DNA strand has the ability to identify individuals.
D、their unique identification can be provided via DNA
答案
B
解析
题干的意思是对第一句中“there are also regions of the DNA strand(也有一些区域具有同样的DNA线谱)”的改写,原因就是前面提到的“because it is inherited(DNA具有遗传性)”,既然是遗传,那么可以推断出具有同样DNA特征的人必定有同一祖先。比较四个选项,B符合这样的意思。
转载请注明原文地址:https://kaotiyun.com/show/fnV7777K
0
大学英语四级
相关试题推荐
Traditionally,theAmericanfarmerhasalwaysbeenindependentandhard-working.Intheeighteenthcenturyfarmerswerequitese
Agreatdealofnonsenseiswrittenaboutthecharacterofanation,chieflybecausemanyobservers,influencedbynationalprid
Agreatdealofnonsenseiswrittenaboutthecharacterofanation,chieflybecausemanyobservers,influencedbynationalprid
A、Themanisusuallythelastonetohandinhistestpaper.B、Themanhasmadeamessofhisfinalexam.C、Themandoesn’thave
A、Itsresultswerejustasexpected.B、Itwasn’tverywelldesigned.C、Itfullyreflectedthestudents’ability.D、Itsresultsf
MostAmericansenjoymovingfromplacetoplaceveryoften.Insomestatesonlyonehouse【C1】______fivehaspeoplelivinginit
MostAmericansenjoymovingfromplacetoplaceveryoften.Insomestatesonlyonehouse【C1】______fivehaspeoplelivinginit
Toooftenyoungpeoplegetthemselvesemploymentquitebyaccident,notknowingwhatliesinthewayofopportunityforpromotio
A、Theytendtostaywithinshoutingorrunningdistanceoftheirparents.B、Theyshouldbeawareofthepotentialrisksinthep
随机试题
运行机制设计的基本内容。
《咬文嚼字》。中,运用心理学“套板反应”原理来说明的道理是
A、氟烷B、盐酸氯胺酮C、盐酸普鲁卡因D、盐酸利多卡因E、丙泊酚为无色易流动的重质液体
下列各项费用中,不应计入产品生产成本的有()。
国家标准、行业标准分为强制性标准和柔性标准。()
我国西部大部分省区特别是()地区水土流失严重,土地荒漠化加快,是自然生态最脆弱、土地生产率最低的地区。
第一次明确地以“明人伦”为教育目的的教育家是()。
设随机变量X服从区间(0,2)上的均匀分布,Y服从区间(X,2)上的均匀分布.试求:(1)X和Y的联合密度;(2)Y的概率密度;(3)概率P(X+Y>2).
Musicoften______usofeventsinthepast.
【B1】【B19】
最新回复
(
0
)