لخّصلي

Start by peeling a ripe banana and placing it in a ziplock bag.You should start seeing a white, cloudy layer forming at the interface between the banana extract and the alcohol.Gently mash the banana inside the bag using your hands or a wooden stick.Add 1 teaspoon of table salt and 2 teaspoons of liquid dish soap to the mashed banana in the bag.Reseal the bag and mix the contents again by squeezing and shaking.

Start by peeling a ripe banana and placing it in a ziplock bag. Seal the bag, ensuring there's no air trapped inside.
Gently mash the banana inside the bag using your hands or a wooden stick. Try to break it down as much as possible.
Add 1 teaspoon of table salt and 2 teaspoons of liquid dish soap to the mashed banana in the bag.
Carefully mix the contents of the bag by gently squeezing and shaking it. Make sure the soap and salt are well-distributed.
Open the bag and add 1 cup of water. Reseal the bag and mix the contents again by squeezing and shaking. This step helps to break down the cell membranes and release the DNA.
Prepare a glass or test tube by placing a coffee filter or a piece of cheesecloth over its opening. You can use a funnel to make this process easier.
Pour the mixture from the bag into the glass or test tube, allowing the liquid to pass through the filter. The filter will separate the liquid from the solid banana debris, leaving you with a liquid extract.
Take the chilled rubbing alcohol from the freezer and slowly pour it down the side of the glass or test tube. Pour until you have twice the volume of alcohol compared to the banana extract. Avoid mixing the two layers.
Let the glass or test tube sit undisturbed for a few minutes. You should start seeing a white, cloudy layer forming at the interface between the banana extract and the alcohol. This is the DNA precipitating out of the solution.
After about 5-10 minutes, you can use a wooden stick or a spoon to carefully lift the DNA strands from the alcohol layer. You may need to twirl the stick to collect the DNA.
Observe and analyze the extracted DNA. You can transfer it to a separate container filled with water if you wish to preserve it for further examination.