Science – DNA

In January we had a special science lesson with a DNA expert.  She explained all about DNA, how many there are, where it is, what it looks like and how big it is (it’s tiny).

We then did a DNA extraction experiment. We were extracting DNA from a banana. Firstly we had to peel, chop and crush the banana.

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We then added some warm water and mushed the banana some more.

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We then filtered it into a beaker so we just had the liquid.

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When we had just the liquid, the lady added some pure alcohol to it.  This caused the DNA strands to separate from the liquid.

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The DNA strands floated on the top of the liquid.

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They separated instantly from the liquid once the alcohol was added.

This lesson was lots of fun.

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