You can do this at home, so try it out!
The skin cells inside your mouth were easily removed by gargling and swishing the water in your mouth. Salty water was used because it mimics the salty fluids inside our bodies. Our cells are protected by “walls” that are really a fatty layer called a membrane, but when you added the drop of detergent you broke open the cell membrane and the DNA was released into the water. When the alcohol layer was added the DNA strands gradually migrated into it and joined to other DNA strands. As more and more strands stuck together, the DNA became visible to the naked eye. Isn’t it amazing that such tiny molecules hold all the information to make you so unique?
You can download the PDF instructions here.