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
DNA Fingerprinting DNA is the genetic material found within the cell nuclei of all living things. In mammals the strands of
DNA Fingerprinting DNA is the genetic material found within the cell nuclei of all living things. In mammals the strands of
admin
2013-11-24
73
问题
DNA Fingerprinting
DNA is the genetic material found within the cell nuclei of all living things. In mammals the strands of DNA are grouped into structures called chromosomes. With the exception of identical siblings(as in identical twins), the complete DNA of each individual is unique.
DNA fingerprinting is sometimes called DNA typing. It is a method of identification that compares bits of DNA. A DNA fingerprint is constructed by first drawing out a DNA sample from body tissue or fluid such as hair, blood, or saliva. The sample is then segmented using enzymes, and the segments are arranged by size. The segments are marked with probes and exposed on X-ray film, where they form a pattern of black bars—the DNA fingerprint. If the DNA fingerprints produced from two different samples match, the two samples probably came from the same person.
DNA fingerprinting was first developed as all identification technique in 1985. Originally used to detect the presence of genetic diseases, it soon came to be used in criminal investigations and legal affairs. The first criminal conviction based on DNA evidence in the United States occurred in 1988. In criminal investigations, DNA fingerprints derived from evidence collected at the crime scene are compared to the DNA fingerprints of suspects. Generally, courts have accepted the reliability of DNA testing and admitted DNA test results into evidence. However, DNA fingerprinting is controversial in a number of areas:the accuracy of the results, the cost of testing, and the possible misuse of the technique.
The accuracy of DNA fingerprinting has been challenged for several reasons. First, because DNA segments rather than complete DNA strands are "fingerprinted": a DNA fingerprint may not be unique; large-scale research to confirm the uniqueness of DNA fingerprinting test results has not been conducted. In addition, DNA fingerprinting is often done in private laboratories that may not follow uniform testing standards and quality controls. Also, since human beings must interpret the test, human error could lead to false results.
DNA fingerprinting is expensive. Suspects who are unable to provide their own DNA to experts may not be able to successfully defend themselves against charges based on DNA evidence.
Widespread use of DNA testing for identification purposes may lead to the establishment of a DNA fingerprint database.
This essay talks about DNA fingerprinting concerning the following aspects EXCEPT______.
选项
A、legal application of the method
B、the way to obtain a DNA sample
C、work yet to be done about DNA fingerprinting
D、possible danger in drawing a DNA sample from the human body
答案
D
解析
转载请注明原文地址:https://kaotiyun.com/show/nMUd777K
本试题收录于:
职称英语综合类A级题库职称英语分类
0
职称英语综合类A级
职称英语
相关试题推荐
Theyallthinkthatthepricesofpersonalcomputerswillsoonplunge.
StopSpamWhenIfirstgotane-mailaccounttenyearsago,Ireceivedcommunicationsonlyfromfamily,friends,andcolleagu
HistoricRoute66:TheStoryofAmerica’s"MotherRoad"1.TheideaforRoute66startedinOklahoma.Citizenstherewantedt
SingingAlarmsCouldSavetheBlindIfyoucannotsee,youmaynotbeabletofindyourwayoutofaburningbuilding—andth
StopSpamWhenIfirstgotane-mailaccounttenyearsago,Ireceivedcommunicationsonlyfromfamily,friends,andcolleagu
ATheWideUseofEnglishBHistoricalAccountofEnglishandItsCommunityCTheAdvantagesofLearningaSecondLanguageDThe
TheattackonFortSumternearCharlestonprovokedasharpresponsefromtheNorth,whichledtotheAmericanCivilWar.
AlthoughSouthCarolina’smineralresourcesareabundant,notallofthemcanbeminedlucratively.
Thelegislativefilibusterisaparliamentarytacticdesignedtodelayorpreventactionbythemajority.
MoreThanJustMoneyWhenPatriciaRochesterdecidedtogobacktoschoolaftertenyearsasastaffnurseatTorontoWester
随机试题
FiveProblemsFinancialReformDoesn’tFixA)Thelegislationconcerningfinancialreformfocusesonhelpingregulatorsdete
Whenthebellrangannouncingtheendofclass,studentscameout______.
朱晓欠李刚3万元,朱晓有辆价值10万元的小车,现朱晓将该车赠与其好友张平,李刚发现朱晓除了该小车外,再无其他值钱的东西,这一赠与会影响朱晓偿还债务,于是向法院起诉主张权利,法院认定_________。
对于采取紧缩战略的组织,人力资源管理的关键活动是()。
心理咨询服务场所最合适在()。
下面是一位实习教师的教学日志,请根据材料回答问题。小黎是初中二年级的一位女生,父母双双外出打工。她个性很特别,在班上,她与同学的关系不太融洽,甚至有点紧张。开学初曾与一名男同学打架,对班主任的批评教育反应强烈,存在明显的抵触情绪。有一次晚自修课上,她戴耳
Wheredoestheconversationmostlikelytakeplace?
Theveryfirsttopicofourdiscussionis"whatisart?"Mytalktodaywillbedividedintotwoparts.Inthefirstpartofmyt
AHealthyMixofReading,WritingandTechnologyI.Aboutstudents’readingA.Childrencannot【T1】theInternetinformationwell
EachtimeKristyIngramtakesarun,herappsareupandrunningbeforesheeventakesoff."IusetechnologyeverytimeIr
最新回复
(
0
)