Extracting DNA from bananas
Mush the banana in the resealable bag for about a minute until it has a pudding - like consistency and all lumps are gone .
Fill a cup with the hot water and salt .
Pour the saltwater mix into the bag , and close the bag .
Gently mix and slosh the saltwater and mashed banana together for 30 to 45 seconds .
Add dishwashing soap into the bag and gently mix the contents .
You do not want the mixture to become too foamy .
Place the coffee filter in a clear glass cup , securing the top of the filter around the lip of the cup .
Pour the contents of the bag into the filter and let it sit until all of the liquid has dripped down into the cup .
Remove and discard the used coffee filter .
Tilt the glass and slowly add cold alcohol down the side of the cup until there is a layer that is 2.5 - 5cm ( 1 - 2in ) thick .
Keep the alcohol and liquefied banana as separate as possible .
Let this two - layered mixture sit for eight minutes .
The longer you wait , the more defined this layer becomes .
This is the DNA pieces clumping together .
Stick the wooden stirrer into the cup .
Spin it in place so that cloudy layer spools around it .
Remove the stirrer .
The substance that you see on the stirrer is DNA ! .
