2. WHAT IS DNA
FINGERPRINTING?
0Did you know that your DNA has a
“fingerprint”?
0It is can be used to identify a person
0If you like shows like CSI then you may
have heard of identifying people by their
DNA
0That is done through DNA fingerprinting
0All you need is some DNA

3. How do you get a DNA
fingerprint?
0First you need some DNA
0Through a process of cutting the DNA
with a restriction enzyme (remember
enzymes from Unit 5?) and then putting
the DNA through Gel
Electrophoresis, the DNA makes a
“fingerprint”
0Gel Electrophoresis – uses gel and
electricity to separate the DNA

5. What are some uses of DNA
fingerprinting?
0Solving crimes
0Determining paternity

6. This is what a DNA
fingerprint looks like….

7. Parents share…
0Bands in the DNA fingerprint with their
children
0Each band in the child’s DNA will be the
same as either their mother and their
father
In forensics, criminals will have matching
DNA fingerprinting to the DNA found at
the scene of the crime

8. Who is the
criminal???
The DNA from
the scene
matches Dino
Online Images. Access Excellence. 13 May 2007.
http://www.accessexcellence.org/AE/AEPC/WWC/1994/fly_forensics.html

9. Look at this old
EOC
question!!!

10. The answer is
suspect C.
They have the
same bands!

11. Results from a single locus
probe DNA fingerprint
analysis for a man and
woman and their four
children are shown in the
autoradiograph to the right.
Which child is least likely to
be the biological offspring of
this couple?
A. Child 1
B. Child 2
C. Child 3
D. Child 4

12. This was a tricky
problem. If child 2 is
the child of this man
and woman, child 2
must have one band
from each of them.
However, child 2
appears to share two
bands with the
mother and none
from the "father."
Obviously, the
mother could not
have contributed
both bands (alleles)
to her child.