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
58
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] 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:http://tihaiku.com/zcyy/2873328.html
相关试题推荐
Becauseofherstrongdesireformaterialwealth,______(她急于进行权钱交易,根本不顾及对更大利益的破
Forthispart,youareallowed30minutestowriteanapplicationletterbecause
Thepredictabilityofourmortalityratesissomethingthathaslongpuzzled
Thepredictabilityofourmortalityratesissomethingthathaslongpuzzled
Thepredictabilityofourmortalityratesissomethingthathaslongpuzzled
Scientistsusedtothinkthatmenaredifferentfromanimalsbecausetheyc
Scientistsusedtothinkthatmenaredifferentfromanimalsbecausetheyc
Scientistsusedtothinkthatmenaredifferentfromanimalsbecausetheyc
Scientistsusedtothinkthatmenaredifferentfromanimalsbecausetheyc
Scientistsusedtothinkthatmenaredifferentfromanimalsbecausetheyc
随机试题
TheHistoryoftheLunchBoxA)Itwasmadeofshiny,br
Skin.Itisthelargestorganofthebody.Skinisthebody’s【C1】______toin
结节性多动脉炎的主要治疗用药为A.非甾体抗炎药 B.对症治疗 C.免疫抑制剂
农会原本是中国共产党领导的以研究农学、改良农业为宗旨的组织。但在1927年7月2
挂篮质量与梁段混凝土的质量比值控制在( ),特殊情况下不得超过0.7。 A、
下列口服降糖药中,最适宜儿童或肥胖型患者的是A.格列吡嗪 B.二甲双胍 C.
2009年,某省全年粮食作物播种面积253.85万公顷,比上年增长1.5%
()提出世界上第一个绿色建筑综合评估系统。A:英国B:美国C:加拿大D:澳
小区会所与一般俱乐部的不同点在于()。A:小区会所功能更全面B:小区会所只对业
牙周病发生的始动因素是A.牙菌斑 B.牙石 C.白垢 D.食物嵌塞 E.
最新回复
(
0
)