首页
登录
职称英语
We all know that DNA has the ability to identify individuals but, because it
We all know that DNA has the ability to identify individuals but, because it
游客
2023-07-27
31
管理
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. [br] If two men suspected for some reason that they have a common ancestor,______.
选项
A、we can decide according to their family tree
B、we can find the truth from their genetic markers
C、we can compare the differences in their Y chromosome
D、we can look for written records to prove their relationship
答案
B
解析
题干的表述相当于第三段第二句的“if two men sharing the same last name believe that they are related”,做题依据是本句的后半句“we can verify this possibility by collecting a sample of DNA from both and looking for common markers(通过采集两个人的DNA样本寻找共同的遗传标记来确定这种可能性)”,B项符合。 C“(比较他们Y染色体的不同”,并非要强调不同,错误。
转载请注明原文地址:https://tihaiku.com/zcyy/2873331.html
相关试题推荐
[originaltext]W:Maybeyoushouldstudycommercialartbecausethat’salittle
[originaltext]W:Maybeyoushouldstudycommercialartbecausethat’salittle
[originaltext]W:Maybeyoushouldstudycommercialartbecausethat’salittle
[originaltext]W:Maybeyoushouldstudycommercialartbecausethat’salittle
Becauseoftherisingcost,wespent____________(两倍的钱)ontheprojectashadbe
Someoldpeople____________(愿意住进养老院)becausetheycanenjoybetterlivingenvir
Cultureshockissonamedbecauseoftheeffectithasonpeoplewhentheye
Cultureshockissonamedbecauseoftheeffectithasonpeoplewhentheye
Cultureshockissonamedbecauseoftheeffectithasonpeoplewhentheye
Athleteswithadifferentkindandlevelofdisabilityarecompetingatthe
随机试题
[originaltext]M:Goodmorning.WillyoubookaplanetickettoLondonforme?W
初产妇,26岁,39周妊娠,阵发性下腹坠胀14小时,昨晚一夜仅能间断入眠共1小时
当无设计要求时,运输钢筋混凝土预制构件时,要求其强度不应小于设计强度等级的(
外斐试验阴性的是A.Q热B.斑点热C.羌虫病D.腺热E.猫抓病
中国海运货物保险中,承保责任范围最广泛的是()。A:一切险 B:平安险 C:
内服能涌吐风痰,外用能收湿、去腐的药物是( ) A.胆矾 B.明矾 C.
微观层面的金融创新大致可以分为以下()类型。A.信用创造型创新 B.风险转移
下列有关重大税收违法失信主体信息公布管理说法正确的有()。A.失信主体法定
下列选项中,属于铸石管主要特点的有()。A.耐磨 B.耐腐蚀 C.具有
下列水利工程施工用电负荷中,属于二类负荷的是()。A.洞内照明 B.钢筋
最新回复
(
0
)