Year 9 Science – Extracting DNA
August 28, 2020
After a diligent midterm of studying heredity and genetics, year 9 students were able to extract DNA from fruit in the laboratory this week. The students performed DNA extracts on papaya, bananas and watermelon.
The students first smashed the fruit in a zip lock in order to destroy the rigid cell wall that surrounds the outside of a plant cell. Then dish soap and salt was added to eliminate the cell membrane and separate the DNA from the nucleus of the cell. The liquid was filtered from the mixture using a coffee filter, and then cold ethanol was added to precipitate the DNA out of solution.
Students gained valuable procedural and laboratory skills, along with developing a concrete grasp of a subject that is often abstract and hard to understand.