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Biology – let’s simplify
DNA FINGERPRINTING
STEP-1. DNA EXTRACTION : BLOOD
SEMEN
CHEEK
SWABS
CHEMICAL
TREATMENT
PURE
DNA
STEP- 2. PCR
Amplification of the sample.
CUTTING : RESTRICTION ENZYMES
Molecular ‘scissors’ : Cut the DNA at specific
site to isolate the VNTRs.
E.g.- EcoRI cuts at 5’…GAATTC…3’
SORTING : GEL ELECTROPHORESIS
• Agarose : Linear polymer extracted
from seaweed.
• Migration of DNA in Agarose Gel
dependent on four factors :-
• Molecular size of DNA
• Conformation of DNA
• Agarose concentration
• Applied current
GEL ELECTROPHORESIS STEPS
DNA is
negatively
charge
molecule.
Smallest DNA
Fragments
move fast.
Largest DNA
Fragments
move slowly.
SOUTHERN BLOTTING
• DNA is ‘blotted’
out of the
Agarose gel on to
a piece of nylon
membrane by
Capillary action.
• ‘Unzipped’ to
produce single
strands of DNA.
PROBING : RADIOACTIVE DNA PROBE
• Nylon membrane is
incubated with radioactive
probes.
• Probes: Minisatellite DNA
tagged with radioactive
phosphorous.
Dna fingerprint : X-RAY FILM EXPOSURE
• Radioactive DNA bands
visualized by exposing the nylon
membrane to X-ray film.
• When exposed to radioactivity a
pattern of more than 30 dark
bands appeared on the film.

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DNA Fingerprinting or DNA Profiling

  • 2. DNA FINGERPRINTING STEP-1. DNA EXTRACTION : BLOOD SEMEN CHEEK SWABS CHEMICAL TREATMENT PURE DNA
  • 3. STEP- 2. PCR Amplification of the sample.
  • 4. CUTTING : RESTRICTION ENZYMES Molecular ‘scissors’ : Cut the DNA at specific site to isolate the VNTRs. E.g.- EcoRI cuts at 5’…GAATTC…3’
  • 5. SORTING : GEL ELECTROPHORESIS • Agarose : Linear polymer extracted from seaweed. • Migration of DNA in Agarose Gel dependent on four factors :- • Molecular size of DNA • Conformation of DNA • Agarose concentration • Applied current
  • 6. GEL ELECTROPHORESIS STEPS DNA is negatively charge molecule. Smallest DNA Fragments move fast. Largest DNA Fragments move slowly.
  • 7. SOUTHERN BLOTTING • DNA is ‘blotted’ out of the Agarose gel on to a piece of nylon membrane by Capillary action. • ‘Unzipped’ to produce single strands of DNA.
  • 8. PROBING : RADIOACTIVE DNA PROBE • Nylon membrane is incubated with radioactive probes. • Probes: Minisatellite DNA tagged with radioactive phosphorous.
  • 9. Dna fingerprint : X-RAY FILM EXPOSURE • Radioactive DNA bands visualized by exposing the nylon membrane to X-ray film. • When exposed to radioactivity a pattern of more than 30 dark bands appeared on the film.