Process on how to extract the DNA of a strawberry

1. How do detectives solve
mysteries of crimes if
there are no CCTV
footages and no
witnesses?

3. You eat DNA everyday. Do you
believe it?
All organisms have DNA.
We can only see DNA if we
use a microscope.

4. DNA Extraction from
Strawberry

5. OBJECTIVES
At the end of the experiment, you should be able
to
– extract the DNA from strawberries and view it
- describe the physical appearance of the DNA of
strawberries

7. 1. Strictly follow the procedures.
2. The experiment will last for 20
minutes only.
3. If you are not sure on what to
do, ask your teacher.
4. CLEAN your table after you
finished.
Experiment

8. Discussion
1. Describe the DNA of the
strawberry.
2. How do the components of
the salt-soapy mixture help in
extracting the DNA?

9. Discussion Describe the DNA of the strawberry.
Some answers are
white fine, white strands
stringy cotton-like fibers

13. Describe the DNA of the strawberry.
Some answers are
white fine, white strands
stringy cotton-like fibers

14. Summary • Break open cells by smashing the
fruit
• Dissolve organelles and cell
membranes with detergent.
• Separate DNA from proteins with
salt:
• Na(+) is attracted to (–)DNA so it
bumps off the protein.
• Filter out the clumps with a
cheesecloth
• DNA precipitates in cold alcohol and
is spooled out.