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B io Factsheet Number 250

Using DNA to solve crimes
This Factsheet:
· Summarises the key techniques of the Polymerase Chain Reaction (PCR) and gel electrophoresis
· Describes how these techniques are used to solve crimes
· Reviews the many exam questions on this topic

Polymerase Chain Reaction (PCR)…

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250 Using DNA to solve crimes Bio Factsheet

PCR can sufficiently amplify the DNA from a single cell (6pg) to · The samples are loaded into wells on a plate of agarose gel that
give a genetic profile. This enables very old crime scene evidence is attached to electrodes…

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250 Using DNA to solve crimes Bio Factsheet

matched or eliminated from the enquiry;
Typical Exam Question pattern is unique to every individual so samples can be
DNA tests were used to confirm the identity of a suspected war radioactive/ single stranded DNA detected on film;
criminal. DNA had…

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250 Using DNA to solve crimes Bio Factsheet

Is the body male or female?
Forensic scientists can identify the sex of even very old corpses by A B C E
analysing the DNA of its bone. PCR is used to copy part of the gene Origin
that codes…




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