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 Extract Your Own DNA
</h3>

 Posted: March 1, 2012


 NOVA Presents: D.I.Y. Science


 How to Extract Your Own DNA


 Ingredients


 (Image of bottled water, clear dish soap, food coloring, table salt, and 70% isopropyl alcohol)


 And… you!


 Step 1: Mix 500 ml drinking water with 1 tbsp salt


 Step 2: Stir until salt is dissolved. Then transfer 3 tbsp of salt water into a clear cup.


 Step 3: Gargle the salt water for 1 minute.


 Step 4: Spit the water back into the cup. Now your cheek cells are suspended in the salt water.


 Step 5: Gently stir the salt water with one drop of soap. (Avoid bubbles as much as possible).


 Note: Soap breaks down the cell membranes, releasing the DNA.


 Step 6: In a separate cup, mix 100 ml isopropyl alcohol and 3 drops of food coloring.


 Step 7: Tilt the salt water cup and gently pour the alcohol so that it forms a layer on top (about 2 cm thick).


 Step 8: Wait about 2.5 minutes. You should see white clumps and strings forming.


 (Image of strings and clumps of DNA)


 That's your DNA!

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