I believe my class is ready for Christmas break. The last few Tuesdays, the students have been lethargic. I thought for sure the extraction of pea DNA would wake them up. Nope.
It is always a good idea to practice your experiments before going into the classroom. Rule #1: If it doesn’t work at home, it will not work in the classroom. Yeah, it really doesn’t.
What you will need:
- A good blender
- Toothpicks (long wooden skewers work best)
- Clear liquid soap (Dawn works best and we used the blue one)
- Glass jar
- Meat tenderizer
- Rubbing alcohol (cold)
I did this experiment at my home the night before co-op. I used Sam’s Club antibacterial hand soap with light moisturizers. It didn’t work, people. It didn’t even work the next day at co-op. See Rule #1 above.
The next week, we begin again. We follow the directions and whirl some peas around.
Then strain the liquid out using a tea strainer.
Add the soap. This time I used the blue DAWN liquid dish soap. The experiment said to use clear, but I didn’t have any. We had no problem with the blue soap.
A coffee stick was used to stir. A wooden skewer works so much better.
After adding cold Rubbing Alcohol (I put it in the refrigerator), there is DNA! Woo-hoo. Students did not care. LOL
The white stringy stuff is the DNA. Looks like nose goo. Lovely.
If you use a long wooden skewer, the DNA will stick to it and you’ll be able to bring the DNA out of the jar for a closer look.
Please have a look at my post from 2009, DNA from Peas! I don’t know how we did it, but this is the best example of this experiment.
I am sorry for not keeping up with what is going on in Biology. This week I have several post scheduled to get us caught up, then we break for Christmas.