PTC tasting optional, requires tasting strips Now, look at your DNA buddy and help each other test for the traits on the list. See if you can do it without giggling. They both got the gene for tongue rolling. I am left-handed, but the kids are right-handed.
Experimental Procedure Chill the rubbing alcohol in the freezer. You will need it later. Set the mixture aside. This is your extraction liquid. Line a funnel with the cheesecloth. Remove the green stems from three strawberries, put the strawberries in a plastic, re-sealable sandwich bag, and push out all the extra air.
Seal the bag tightly. With your fingers, squeeze and smash the strawberries for 2 minutes. After this the strawberries should look like Figure 3 below.
After smashing the strawberries for two minutes, they should look like the ones in this image. Push out all the extra air and reseal the bag. The liquid detergent will help break the strawberry cells open, allowing the DNA to spill out.
The salt helps create an environment where the different strands of DNA can gather together in a clump, making it easier for you to see them.
Squeeze the strawberry mixture with your fingers for 1 minute. Do you notice any differences in the mixture after mixing it for 1 minute? After this the strawberries should look like Figure 4 below. After smashing the strawberries with the extraction liquid for one minute, the mixture should look like the one in this image.
Pour the strawberry mixture from the bag into the funnel. Let it drip into the glass until there is very little liquid left in the funnel i.
You may need to be patient as it can take some time for the liquid to filter through the cheesecloth. Be sure not to let any pulp go around the cheesecloth and end up in the drinking glass below. If this happens, you will need to pour the liquid through the cheesecloth again, into a new drinking glass.
Throw away the cheesecloth and the strawberry pulp inside. The alcohol should form approximately a one-inch deep layer on top of the strawberry liquid. If you have a small test tube or jar you will not need all of the alcohol.
Do not let the alcohol and strawberry liquid mix. The DNA collects between the two layers. DNA does not dissolve in alcohol. When alcohol is added to the mixture, the rest of the mixture, except for the DNA, stays in solution, while the DNA precipitates out into the alcohol layer.
Study the mixture inside of the test tube or jar. Do you see anything in the jar that might be strawberry DNA? If so, where in the jar is it? Record your observations in your lab notebook. You can collect the DNA with a skewer or other thin rod.
Dip the bamboo skewer into the test tube to where the alcohol and strawberry layers meet. Pull up the skewer. You should find some whitish, stringy stuff on the skewer, which is DNA containing strawberry genes!
If you like this project, you might enjoy exploring these related careers: Biological Technician What do the sequencing of the human genome, the annual production of millions of units of life-saving vaccines, and the creation of new drought-tolerant rice varieties have in common?Ever wondered how simple household items create such beautiful scientific models?
You have to make it to believe it. Follow the directions to make your own DNA model and get noticed at a . This article includes several 3-D DNA models that look great on display.
You can make your model from candy, from pipe cleaners, or from foam balls and toothpicks.
Use them for your science fair project or for an extra credit project. better DNA. intrexon designs and engineers living systems to address the world’s greatest challenges in health, energy, food, and environmental sustainability.
A 3D DNA model will enable kids to understand the concept of DNA in a fun and interesting way. Be it for a school project or just an activity to study DNA better, making a model can be fun and exciting too!
And yes, simple materials are all you need, to make this model. The Molecular Models DNAC 17 Base Pair DNA Model Kit is completely assembled, has a rotating base, and stands 3' high. This molecular model of a double helix with 17 base pairs is used in educational settings to teach about DNA. Building a model of a DNA helix in class will help students visualize DNA's construction and learn about the life-giving genetic code.
Using some simple items like toothpicks, plastic foam balls, craft paint and pipe cleaners, you can represent all of the parts that make a DNA helix in a classroom setting.