Do it yourself DNA

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Do it yourself DNA

Postby susteacher » Thu Mar 13, 2014 5:34 pm

My daughter and I really enjoyed doing this project with the strawberries. She's making it her own, by trying out different fruits. We selected them by researching which foods are octoploids or have multiple copies of genes. Now to my question, the DNA absolutely precipitated and we could see it, but we could not get the DNA to stick to anything outside of the test tube. I could get a picture as it fell off of part of a clothespin (the only wood item we had in the house.) We were using metal skewers, since that was all I could find. As we are redoing it today, she is thinking she used too much salt in her extraction solution yesterday--1 tsp instead of 1/2 tsp. Any chance this could have been the problem? Also, we're trying bananas. The mixture is so think, even after mashing that's it's not coming through the cheesecloth very well. Could we add more water? Could we run it through a blender? What might help?
susteacher
 
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Project Question: Do it yourself DNA
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Project Status: I am finished with my experiment and analyzing the data

Re: Do it yourself DNA

Postby cbrambley » Fri Mar 14, 2014 10:35 am

Hey there,

I would suggest to use a thinner wooden object, ideally something like a toothpick or chopstick. Try to gently rotate the toothpick so that the dna spools around it. I'm not really sure if adding too much salt affects this, but it couldn't hurt to play with the proportions a little and see what happens. As for your banana problem, you could either try using more of the extraction liquid, or less banana. Of course make sure you're mashing it up well enough. Oh and also I used to use coffee filters instead of cheesecloth. I'm not sure if that'll help you much, but it's something to try if you have coffee filters on hand.

Hope that helps!
cbrambley
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Re: Do it yourself DNA

Postby susteacher » Fri Mar 14, 2014 10:44 pm

Thanks for the ideas! We gave up on the different fruits and compared detergents instead. We had another detergent do better detergent wise, but never could get it removed. We took pictures to document instead.
susteacher
 
Posts: 2
Joined: Thu Mar 13, 2014 5:09 pm
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Project Question: Do it yourself DNA
Project Due Date: n/a
Project Status: I am finished with my experiment and analyzing the data

Re: Do it yourself DNA

Postby sjrogers113 » Wed Dec 17, 2014 11:02 am

Hello,
My daughter is doing this experiment with strawberries and using different detergents to see which one precipitates more DNA. They are required to use the scientific method. I believe that requires for them to be able to measure the results, and provide it as data so that we can make a graph or chart. We tried to weigh what we were able to get on a skewer, but it is so light that it doesn't register on the scale. Any ideas of how we can record the results of this with data? We would like to do a chart or graph because I think the scientific method requires that, but I'm not sure.
Thank you,
Shelley
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Project Question: Weighing DNA extracted from Strawberries
Project Due Date: January 2 2015
Project Status: I am conducting my experiment

Re: Do it yourself DNA

Postby connief » Sat Dec 20, 2014 2:37 pm

Hi sjrogers113,

To answer your question, as far as I know, there is no easy way to weigh or quantify the amount of DNA you extracted without more sophisticated lab equipment. Perhaps other experts may have more ideas of how to determine DNA amounts using items that are easily accessible for younger students. The scientific method doesn't necessarily require you to make a measurement. You can just record what you observe. For example, with the detergents you used, were you able to extract DNA from the strawberries? How were these detergents different from each other? Did you use detergents from different brands, or did you just use different concentrations of the same detergent? When you look by eye and estimate, which detergent condition seems to extract the most DNA?

Let us know if you have anymore questions!

Connie
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