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
42
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://jikaoti.com/ti/hbLFFFFM
0
大学英语四级
相关试题推荐
Traditionally,theAmericanfarmerhasalwaysbeenindependentandhard-working.Intheeighteenthcenturyfarmerswerequitese
DowningStreetisthemostexclusivestreetinBritain,notbecauseitonlyhasthreehousesalongitsshort【B1】______,norpart
Agreatdealofnonsenseiswrittenaboutthecharacterofanation,chieflybecausemanyobservers,influencedbynationalprid
A、Themanisusuallythelastonetohandinhistestpaper.B、Themanhasmadeamessofhisfinalexam.C、Themandoesn’thave
YoungpeopleintheUnitedStateshaveawidevarietyofinterestsapart【C1】______theirschoolwork.Aschildren,bothboysand
Technologyisanothergreatforceforchange.Inpart,technologyhascausedthepopulationexplosion;manyofuswon’tnowbea
Despite/Inspiteoffinancialdifficulties(crisis)。此题考查短语despite/inspiteof“尽管”的表达法。
A、Theirparentsaccompanyandteachthem.B、Theygotoaregularschool.C、Hollywoodteachersgivethemlessons.D、Theygetthei
WithinfifteenyearsBritainandothernationsshouldbewellonwiththebuildingofhugeindustrialcomplexesfortherecyclin
随机试题
特许协议与许可证协议的关系是()
简述非洲地区经济一体化组织的特征。
按照索赔的目的不同,施工索赔可分为( )。
某投资项目各年的预计现金净流量分别为:NCF0=一200万元,NCF1=一50万元,NCF2-3=100万元,NCF4-11=250万元,NCF12=150万元,则该项目包括投资期的静态回收期为()。(2011年)
单位内部会计监督的对象是会计机构、会计人员及管理人员。()
小张大学毕业后到一家国有企业工作,年薪4万元。岗位津贴1万元;他还利用业余时间搞一些技术发明,一年的技术转让所得为1万元,期间炒股获得收益2万元。小张上述收入中,按劳分配和按资本要素分配的收入分别为()。
下列说法中,不正确的是()。
如图所示,有一个信号源和五个接收器,接收器与信号源在同一个串联线路中时,就能接收到信号,否则就不能接收到信号。若将图中左端的六个接线点随机地平均分成三组,将右端的六个接线点也随机地平均分成三组,再把所有六组中每组的两个接线点用导线连接,则这五个接收器能同时
(2013山东)2011年深交所成交金额最低的季度,其成交金额占全年两市总成交金额的:
下面关于嵌入式系统的互连通信接口的叙述中,错误的是()。
最新回复
(
0
)