They have learned about DNA and know that your genetic plan is carried on this double helix.
Here they have a go at extracting the DNA from an onion.
First get your equipment ready
You need some pureed onion
and add salt water to it
And mix it up
Then filter the suspension
You must get 50ml of filtrate
Now add some washing up liquid and then cold ethanol
Add the ethanol very carefully
And then you have finished
Se the layer of cloudy white stuff in the middle
That is DNA
Did you know that onion cells have more DNA than our cells!
Scientists think that most of it is junk DNA but some genes like those for metabolism will be the same as the metabolism genes that are in our cells.
