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why is PCR a necessary step in the analysis of a DNA sample taken from a crime scene A: the sample yields very little DNA B: the sample may be contaminated C: the sample undergoesdegradation D: the sample may not provide an accurate sequence

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Diatonic254
The answer is A. The sample from a crime scene does not have enough DNA to perform forensics tests such as DNA matching. PCR -polymerase chain reaction - is used to amplify the DNA to required amount. Each cycle of PCR amplifies DNA two-folds

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