Strawberry DNA

To extract DNA from strawberries, start by preparing an extraction solution by mixing 1-2 drops of dish soap, 1/4 teaspoon of salt, and 1/2 cup of water. This mixture helps break down cell and nuclear membranes, releasing the DNA. Remove the green tops from one or two strawberries and place them in a resealable plastic bag with the extraction solution. Seal the bag and gently mash the strawberries for about 2-3 minutes, taking care not to create too many bubbles. Afterward, filter the mashed mixture by pouring it through a coffee filter or cheesecloth over a glass, allowing only the liquid to drain through while larger debris is filtered out. Next, slowly pour chilled rubbing alcohol down the side of the glass to form a layer on top of the strawberry liquid; wait a few seconds to see DNA appear as a white, cloudy substance between the alcohol and strawberry layers. Finally, use a toothpick or wooden stick to gently pull out the DNA strands, which should look thick and somewhat stringy. The dish soap in this experiment breaks down cell membranes, salt aids in DNA clumping, and the cold alcohol helps the DNA precipitate, making it visible.

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Reflection

Conducting the strawberry DNA extraction experiment was a fascinating hands-on activity that deepened my understanding of DNA and its role in living organisms. Watching the DNA strands materialize from a simple fruit felt almost magical. We as a group wondered what if we can do it with blood, will be able to see DNA? But I think that is the amazing part of science which is always open for research and observation.

What stood out most to me was how relatively simple it is to extract DNA using everyday materials like dish soap, salt, and rubbing alcohol. It was surprising to learn that such basic substances can break down cell walls and membranes, allowing the DNA to clump together and become visible to the naked eye. I had previously thought DNA could only be seen or extracted in a highly specialized lab environment, so discovering how accessible this process is was new to me. I think this activity would be more suitable for grade 4 - 6 and will give them lifetime understanding of what DNA is and how it looks like.