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
85
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.
SharksPerformaServiceforEarth’sWatersItishardtogetpeopletothinkofsharksasanythingbutadeadlyenemy.They
Languageteachersoftenextractexamplesfromgrammarbooks.
TightenedVisaRegulationsAccordingtoSouthKorea’snewvisaregulations,nativespeakersofEnglishinSouthKoreawillb
Itislogicalthatadetailedlearningofplantsandtheirpropertiesmustbeextremelyancient.Tribeslivingtodayinthejun
IntegratingAllCommunications1.Haveyoueverfeltfrustratedwhenyouhavetocontactyourfriends,butcannotreachtheme
AlthoughSouthCarolina’smineralresourcesareabundant,notallofthemcanbeminedlucratively.
Migrant(移民的)WorkersInthepasttwentyyears,therehasbeenanincreasingtendencyforworkerstomovefromonecountryto
TheDangersofSecondhandSmokeMostpeopleknowthatcigarettesmokingisharmfultotheirhealth.Scientificresearchshow
Iwasastonishedatthenewsofhisescape.
随机试题
在这种路口遇到行人突然横穿怎么办?
张某系某县人民政府卫生局的一名副科长。2003年3月,张某因在街头与人争吵,失手将他人打伤,因而受到行政拘留处罚。县卫生局非常重视此事,鉴于其行为造成恶劣的社会影响,除对张某进行严肃批评教育外,并依照法定程序给予张某撤销副科长职务的行政处分。张某对此没有异
肝气上逆的临床表现有
女性,35岁,颈前区肿块10年,近年来易出汗、心悸,渐感呼吸困难。体检:晨起心率104/分,BPl20/60mmHg;无突眼,甲状腺Ⅲ度肿大,结节状,心电图示:窦性心律不齐。最佳的治疗方法是
下列霍乱休克抢救中哪项措施是错误的
影响药物制剂稳定性的处方因素不包括()
下列偏差分析方法的优点中,表格法所没有的是()。
北伐战争中在湖北和湖南战场上消灭的是()的主力。
汉代积极地经营西域地区,在河西走廊设有四郡,其中不包括()
若a,b都是质数,且a2+b=2003,则a+b的值等于().
最新回复
(
0
)