首页
财务会计
医药卫生
金融经济
考公考编
外语考试
学历提升
职称考试
建筑工程
IT考试
其他
登录
职称考试
DNA Fingerprinting DNA is the genetic material found within the cell nuclei ...
DNA Fingerprinting DNA is the genetic material found within the cell nuclei ...
admin
2020-12-24
53
问题
DNA Fingerprinting
DNA is the genetic material found within the cell nuclei of all living things. In mammals (哺乳动物)the strands of DNA are grouped into structures called chromosomes (染色体) With the exception of 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 (唾液)_ The sample is then segmented using enzymes (酶),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 an 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.
If two sisters are identical twins,their complete DNAs are_.
选项
A the same
B unique
C different
D similar
答案
A
解析
文本第一段最后一句话提到 “With the exception of identical twins,the complete DNA of each individual is unique”,说明除了双胞胎这个特殊情况外,每个人的完整DNA都是 独一无二的,所以答案是A。
转载请注明原文地址:https://ti.zuoweng.com/ti/6VEQKKKQ
相关试题推荐
Wehavetoactwithintheexistinglegalframework.A:limitB:procedureC:status
Wehavetoactwithintheexistinglegalframework.()A.limitB.procedureC.statu
共用题干 第三篇EatMore,WeighLess,LiveLongerClevergeneticdetectiveworkmayh...
共用题干 第三篇EatMore,WeighLess,LiveLongerClevergeneticdetectiveworkmayh...
共用题干 第三篇EatMore,WeighLess,LiveLongerClevergeneticdetectiveworkmayh...
Wehavetoactwithintheexistinglegalframework.A.limitB.systemC.procedu
34Inthispassage,thethreegeneticallyengineeredmedicalproductsarep...
32GeneticengineeringmaybedefinedasAthealteringofnormalcellreproduc
DNAFingerprinting DNAisthegeneticmaterialfoundwithinthecellnuclei...
DNAFingerprinting DNAisthegeneticmaterialfoundwithinthecellnuclei...
随机试题
数据新闻是个强大的工具,______了电脑科学、统计学以及社会科学在大数据研究方
患者,男性,65岁。高血压10年,近半年来经常半夜胸闷、胸痛发作,起床活动后好转
评估机构对甲企业的下列资产进行了评估,具体情况如下: (1)甲企业总部位于广州
医疗机构制剂的特征有
过多摄人膳食纤维会导致( )。
中果皮组织横切面可见6个油管的药材是
作为社会权利的主体,青少年儿童主要享有的合法权利有()。 A.受教育权 B.
339,516,236,729,428,() A.305 B.311 C.
一种记忆的特点是:信息的保存是形象的,保存的时间短、保存量大,编码是以事物的物理特性直接编码,这种记忆是() A.短时记忆B.瞬时记忆 C.长时记...
胎儿生物物理评分不包括哪项A.胎儿呼吸样运动B.胎动C.无应激试验D.羊水容量E.震荡试验