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Extract Strawberry DNA

Cool Science

overview

extract DNA from strawberries. so fun and science-y we love this project! (you can even try this experiment with your saliva, to see your *own* DNA.)

45 minutes

maker checklist

  • 4 ripe strawberries
  • large cup or jar
  • square of cheese cloth
  • small plastic bowl
  • craft stick for stirring
  • teaspoon for measuring 
  • 1/3 cups water
  • 1 tsp salt
  • 2 tsp blue Dawn dish soap
  • 2 tsp rubbing alcohol
  • funnel
  • test tube
  • pipette
  • small wooden skewer

instructions

1

the day before…. remember to get strawberries! chill your rubbing alcohol in the fridge.

2

mix together the dish soap, water and salt in a small bowl and set aside. this is your extraction liquid.

3

trim your strawberries and put them in a sealable plastic baggie. squeeze them with your hands until the strawberries are all mashed up.

4

add three tablespoons of the extraction liquid to the strawberries in the bag. re-seal the bag, and gently squeeze until combined.

5

line the funnel with cheesecloth and set it over the double cups. pour the strawberry mixture in; let sit. the liquid will drip through.

6

pour this liquid into a test tube so that it comes about 1- to 2-inches high.

7

using a pipette, carefully add an equal amount of the chilled rubbing alcohol to the test tube.
add it slowly so that it trickles in!

8

let the mixture sit, and watch as the strawberry’s DNA rises up out of the red mixture and into the clear alcohol. cool!

9

dip the wooden skewer into the solution and catch some of the gooey white stuff. this is the DNA!