What is the purpose of the strawberry DNA extraction lab?
Background: The long, thick fibers of DNA store the information for the functioning of the chemistry of life. DNA is present in every cell of plants and animals. The DNA found in strawberry cells can be extracted using common, everyday materials.
What is the function of cold ethanol in the strawberry DNA extraction experiment?
A cell’s DNA is usually protected from such enzymes (called DNases) by the nuclear membrane, but adding detergent destroys that membrane. The cold alcohol helps the DNA precipitate (solidify and appear) more quickly. Salty water helps the DNA precipitate (solidify and appear) when alcohol is added.
Why strawberries work better than human cells in this extraction lab?
While other fruits are soft and just as easy to pulverize, strawberries are the perfect choice for a DNA extraction lab for two very good reasons: (1) they yield way more DNA than other fruits, and (2) they are octoploid, meaning that they have eight copies of each type of DNA chromosome.
Why detergent is used in DNA extraction?
During a DNA extraction, a detergent will cause the cell to pop open, or lyse, so that the DNA is released into solution. Then alcohol added to the solution causes the DNA to precipitate out.
Why is it so easy to isolate DNA from strawberries?
Why use strawberries? Strawberries are octoploid, meaning that their cells each have eight duplicate copies of each chromosome. This gives the cells a lot of DNA, which means it is easier to extract a large amount of DNA that is visible to the naked eye.
Why is it easier to extract DNA from strawberries than humans?
Each little piece of a living thing, known as a cell, has DNA in it. In humans each of these cells have 2 copies of the DNA, but in strawberries each of these have 8 copies of the DNA (scientists call this octoploid). That means strawberries have 4 times as many copies of DNA as humans, making it 4 times easier to see!
Why onion is used for DNA extraction?
An onion is used because it has a low starch content, which allows the DNA to be seen clearly. The salt shields the negative phosphate ends of DNA, which allows the ends to come closer so the DNA can precipitate out of a cold alcohol solution.
How do you separate DNA from strawberries?
Place the coffee filter inside the other plastic cup. Put the strawberries into the plastic bag, seal it and gently smash it for about two minutes. Completely crush the strawberries. This starts to break open the cells and release the DNA.
Why is detergent used in DNA isolation process?
Detergent contains sodium laurel sulfate, which cleans dishes by removing fats and proteins. It acts the same way in the DNA extraction protocol, pulling apart the lipids and proteins that make up the membranes surrounding the cell and nucleus. Once these membranes are broken apart, the DNA is released from the cell.
How can you extract DNA from a strawberry?
To begin the strawberry DNA extraction lab, a mixture of detergent, salt and water is prepared. This mixture is added to smashed strawberries, and is then filtered through cheesecloth to remove the pulp. The detergent mixture dissolves the nuclear membrane that contains the cell’s DNA, allowing the DNA to clump and extract from the cell.
Why to use a strawberry for DNA extraction?
While other fruits are soft and just as easy to pulverize, strawberries are the perfect choice for a DNA extraction lab for two very good reasons: (1) they yield way more DNA than other fruits, and (2) they are octoploid, meaning that they have eight copies of each type of DNA chromosome.
Why is Strawberry DNA easier to extract?
While other fruits are soft and just as easy to pulverize, strawberries are the perfect choice for a DNA extraction lab for two very good reasons: (1) they yield way more DNA than other fruits, and (2) they are octoploid, meaning that they have eight copies of each type of DNA chromosome.
What is Strawberry DNA?
Do-it-Yourself Strawberry DNA. Strawberries, bacteria, humans—all living things have genes, and all of these genes are made of DNA. That’s why scientists can take a gene from one living thing and put it into another. For example, they can put human genes into bacteria to make new medicines.