In this activity, students crush strawberries and use detergent and salt to break the cell wall so that DNA will be released into the solution. Alcohol is then poured slowly over the top of the solution and DNA will rise to the surface. Students can spool the DNA with a stirring rod or toothpick. Because strawberries have multiple copies of DNA (octoploid), the extraction is simple and works every time! Even very young students can do this.
Worksheet contains instructions and discussion questions.
Grade Level: 5-12 | Time Required: 30 min
HS-LS3-1 Ask questions to clarify relationships about the role of DNA and chromosomes in coding the instructions for characteristic traits passed from parents to offspring