Observing The Cell Cycle Biology Worksheet Page 29
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29Investigation 12B
DNA Forensics
C
Exploring on your own
A technique called DNA fingerprinting produces an image
of patterns made by a person’s DNA. Using an enzyme,
scientists “cut” DNA strands in specific places. The DNA
fragments are injected into a gel and an electric current is
applied. As the fragments migrate across the gel, they
create patterns. Those patterns (DNA fingerprints) are
related to the base sequences along the DNA strand.
Suppose a serious crime has been committed. There are six
suspects. Since blood was found at the crime scene, DNA
fingerprints can be produced. Blood is drawn from the six
suspects
and
DNA
fingerprints
are
produced.
By
comparing the DNA fingerprints of the suspects to the
blood from the crime scene, police quickly determine who
committed the crime. Can you tell who committed the
crime?
3
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