Everyone could be identified because in the sequences there base pairs. Because there are so many base pairs it would take a very long time - so scientists can use a shorter method by repeating the DNA patterns, this is called DNA fingerprinting.
These patterns do not give an individual fingerprint, but they are able to tell whether two DNA samples are from the same person, related people, or non-related people.
The only problems with DNA fingerprinting are: it is hard to identify specific people, the scientists have to make sure they know who's print it is especially in criminal cases.
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