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How can DNA profiling solve crimes?
There may only be a few drops of blood or a single hair left at the scene of a crime, but this is enough to get a DNA STR profile. Forensic scientists can compare the STR profile of a blood sample with that of a suspect or the victim, to look for a match. If two DNA profiles match there is only a one-in-a-billion chance that they are from two different people – unless they are identical twins.
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Analysing a DNA STR profile.
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