Fun Friday – Five Fantastic Facts about DNA and how to extract DNA from a banana

Fun Friday – Five Fantastic Facts about DNA and how to extract DNA from a banana

Dr. Simple was explaining a little about DNA in the last post, so I thought I would share one of the first experiments my children ever asked me to do with them…. they wanted to see DNA, so we extracted it from a banana.

Did you know that we share approximately 50% of our DNA with bananas?
Did you know that we share approximately 50% of our DNA with bananas?

 

You will need

… a banana, a fork, a bowl, washing up liquid, ice cold surgical spirits (or isopropanol – both available from a pharmacy), salt, a sieve, a glass jar.

 

What to do…

Remove the banana skin and mash the banana in the bowl, using the fork. Add two teaspoons of washing up liquid and stir slowly.

Add a teaspoon of salt and one to two tablespoons of water and stir carefully.

You want to avoid making bubbles.

Leave for five minutes then strain carefully through the sieve into the jar.

Tilt the glass jar and carefully pour the surgical spirits down the side of the jar, at least as thick as the banana layer.  This will form a separate layer on top of the banana mixture.

Do not mix.

After five to ten minutes you will see a long, stringy substance appear in the top layer. This is the banana’s DNA.

You can use a tooth pick to lift and examine the DNA.

 

So what is happening?

The salt and washing up liquid break open the banana cells, releasing the DNA.

The DNA will not dissolve in the surgical spirits (or any alcohol) so it floats in this layer.

 

Here are a five fantastic facts about DNA…

5 Facts about DNA
5 Facts about DNA

The experiment described above is just a quick and simple method that I have used before but if you want something more scientific and a lot more fun… check out Cell Explorers! They do amazing school visits, for junior infants right up to secondary level students,  which I am sure would be of interest to teacher or parents making suggestions in their own schools. Run by Dr. Muriel Grenon and her wonderful team of students and graduates these activities are really top class!  Contact them by email at cellexplorers@nuigalway.ie

 

 

A Simple Slice of Science – How can I make two of me?

A Simple Slice of Science – How can I make two of me?

This week’s question for Dr. Simple is a real gem and comes from six year old Abigail (you might find her mentioned here too)…

How can I make two of me?

I think if Abigail is asking these questions at the age of six then she will really go far, don’t you agree?

Here is what Dr. Simple has to say on the matter… and don’t adjust your screens if you think you are seeing double!

 

HowCanIMakeTwoOfMyself

 

Transmogrifier
Image source: http://calvinandhobbes.wikia.com/wiki/Transmogrifier

So there you have it! Hopefully a simple answer to a really wonderful question. It certainly opens up the discussion of whether we should be cloning or not. As a geneticist myself I wouldn’t be encouraging it, but I do have a much simpler answer… I reckon if Abigail could just build herself a Transmogrifier then she will really have nailed the whole cloning thing. She could turn herself into another Abigail and the job would be done!

If you do make one Abigail, can I borrow it?