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;largescale 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 _________.
A.the same
B.unique
C.different
D.similar
37、 DNA fingerprinting is a technique of _________.
A.grouping DNA strands into structures
B.segmenting DNA with probes
C.constructing body tissues by enzymes
D.identifying a person by comparing DNAs
38、 DNA fingerprinting was first used in _________.
A.criminal investigation
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