05 找到猕猴桃的DNA Finding the DNA of a kiwifruit

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You've probably all heard of DNA. It's usually referred to as the blueprint of life.

Now DNA is in all the cells of all living things, including ourselves. But it's kind of difficult to comprehend because you can't see it.

Well, it turns out that with a very simple kitchen experiment, you actually can see DNA. And that's what we're going to do now.

I'm going to extract the DNA from this kiwifruit. Now it doesn't have to be a kiwi.

You can use an onionor strawberries. Raid the fruit bowl and pick what you fancy.

You can even use defrosted frozen peas if you haven't got anything fresh. You're also going to need some ice-coldalcohol.

I'm using methylated spirits, and it needs to be in the freezer for half an hour before you start the experiment. You could try something like vodka or very strong white rum as well.

And you're going to need a fine sieve, or you could use coffee filter paper. I'm just using a tea strainer. The first thing I'm going to do is peel the skin off the kiwi. And that's because it's mostly dead, and it hasn't got very much DNA in it anyway.

So now I'm going to chop it up into small pieces. And then I'm going to start mashing it. This is to start breaking up the cells and to give us a bigger surface area to extract the DNA from.

The next thing you need to do is mix together two grams of salt with 100 milliliters of water. And add this to five grams of washing up liquid.

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