dna fingerprinting!
TRANSCRIPT
DNA Fingerprintin
g!By: Megan Riehle
Overall Process
http://www.youtube.com/watch?v=drC7rR7CIBg
Video of DNA Fingerprinting Process
Isolation of the DNA!
In order for a DNA fingerprint to be made you must first gather DNA from the person you are fingerprinting.
There are many things you could use to gather DNA…
1. Blood2. Hair3. Skin4. Saliva5. Or any other cell
with DNA in it.
Human Cheek Cells
Restriction Enzymes
• Used to cut DNA into pieces that are specific to each individual persons DNA.
• Specific Enzymes cut the DNA into pieces at specific places as well. For Example…
• EcoR1 cuts only when the sequence GAATTC occurs.
Restriction Enzymes Continued!
• Sticky Ends are made by cutting the DNA in a staggered manner and they have a one stranded DNA sequence that have complementary nucleotides
• Blunt Ends are made by cutting the DNA directly down the middle of two nucleotides
Gel Electrophoresis
• Samples of cut DNA are placed in an agarose gel
• Electricity is added to the gel and the DNA travels to the positive pole and they are spread out according to size.
Transfer to Nylon Screen
• Because the gels are so hard to manipulate the DNA pattern is transferred to a nylon sheet using the process of southern blotting
• Nylon is added to the agarose gel and then a piece of paper is added on top this absorbs the DNA bands onto the nylon.
Probing and X-Ray• Probes are radioactive particles that
bind themselves to the main sequence.
• Extra probes that are left over are removed and what is left is only the DNA chain needed to make the fingerprint
• This can be scanned by an X-ray machine and it will produce a picture of the DNA fingerprint
Examples of DNA Fingerprints!
Uses for DNA Fingerprints
• Paternity Testing• Determining who committed a crime
• Diagnosis of inherited disorders• Developing Cures for inherited
disorders
Ethical Concerns
• People worry that the use of DNA will eventually lead to discrimination using DNA also known as genoism.
• People could be denied health care, an education, a job etc.
Crime Scene Investigation!!!!
http://www.teachersdomain.org/asset/tdc02_int_creatednafp2/
TEST YOUR ABILITY TO DISCOVER THE CULPRIT
OF THIS TERRIBLE CRIME USING WHAT YOU HAVE
LEARNED ON DNA FINGERPRINTING!