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B2 High-Intermediate 1667 Folder Collection
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Hi, I am Benyamin. Today I am gonna show you
how extract DNA from a Strawberry at home
In order to study DNA scientists have to
extract it from cells
there are many DNA extraction kits
available for scientists to use in the lab
but they all work in roughly the same way
This experiment lets you make your own
DNA extraction kit from common household materials
okay, lets check it out
Here is what you need
Isopropyl alcohol or rubbing alcohol
dish soap, salt, water, plastic bag
beaker or test tube
or you can use a small clear glass jar
measuring cups, strainer, tweezers and safety glasses
Step 1: put the isopropyl alcohol or rubbing alcohol in
the freezer to chili it
Step 2: Measure 100 ml of water then add
10 ml of dish soap and half of teaspoon
salt to the water and mix it up
this will be your extraction liquid
Step 3: put the strawberry in the plastic bag
and then add the extraction liquid you just
made to the plastic bag too
Step 4: Remove as much air as possible
and seal the bag
after that mash the strawberry with your
hands for 2 minutes until there are no big pieces
this is what it will look like
Step 5: use a strainer to separate the liquid
from the strawberry pulp
Step 6: Now, transfer the liquid to a small beaker
or a small clear glass jar
Step 7: add 5 ml of iced Isopropyl alcohol
or Rubbing alcohol and wait for a few minutes
the alcohol will form a layer on top of
the strawberry juice
Step 8: okay, now you should see stringy
whitish stuff collecting between two layers of liquid
this is DNA !
you can gently pull the DNA out with the tweezers
the detergent I used caused the cells
to pop open or lyse
this releases the DNA into the solution
and the alcohol causes the DNA
to precipitate out of the solution
you can do this experiment on most any living thing
try this experiment using other fruits, vegetables
or soft meats like chicken liver
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in the comments with us and be sure
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B2 High-Intermediate

Extract DNA from a Strawberry at Home - Cool Science Experiment

1667 Folder Collection
Cheng-Hong Liu published on February 20, 2015

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