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Diagnostic testin1

Diagnostic testin1 - Diagnostictesting. .Thebasic...

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Diagnostic testing. Recombinant DNA and biotechnology have opened a new era of  diagnostic testing and have made detecting many genetic diseases possible. The basic  tool of DNA analyses is a fragment of DNA called the DNA probe. A DNA probe is a  relatively small, single-stranded fragment of DNA that recognizes and binds to a  complementary section of DNA in a complex mixture of DNA molecules. The probe  mingles with the mixture of DNA and unites with the target DNA much like a left hand  unites with the right. Once the probe unites with its target, it emits a signal such as  radioactivity to indicate that a reaction has occurred.  To work effectively, a sufficiently large amount of target DNA must be available. To  increase the amount of available DNA, a process called the polymerase chain reaction  (PCR) is used. In a highly automated machine, the target DNA is combined with 
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