In this lesson, students participate in lab activity designed to help them define qualities that result in reliable and meaningful scientific research. Students are asked to develop an experimental protocol for extracting DNA from whole strawberries. By having students create their own procedures, students learn the importance of making strong arguments in science as they use evidence and reasoning to support their claims. They also communicate, collaborate, and skeptically evaluate each other’s claims. After each group tests their initial protocol, students present their findings in a l class seminar discussion based on a lab meeting in order to collectively “make sense” of their findings. During the lab meeting, students use the class’s “norms of discourse” to skeptically and collaboratively develop a new combined class protocol. Teams then repeat the lab activity using the class-developed protocol
1 Lesson plan
Resource cards with information about each reagent available for students to develop their protocols.
Check out SEP teacher Hannah Crowder's website for an online flipcard version of the DNA Extraction Resource Cards.
These links are for SEP teachers who are part of the kit loan program. To become a part of the kit loan program you must complete the 3 week professional development program.
Extract DNA from cells using steps and reagents similar to those used in research labs and learn the methods involved in DNA isolation.
This protocol uses images to describe the various steps of the extraction, and is useful for younger learners.
A step-by-step explanation of the function of each ingredient in the lysis solution.
Morphology and Physiology of the Strawberry
Go deep into the strawberry plant with this article by G. M. Darrow.
Plant C-value Database (DNA content per cell)
C-value is the haploid amount of nuclear DNA per cell in a species. This database is hosted by the Royal Botanical Gardens or Kew Gardens. You can use this information to estimate the maximum amount of DNA you might extract from a plant tissue sample.
The Strawberry Plant Defense Mechanism: A Molecular Review
While you are at the Kew Gardens main page, take a look at the videos and the scientific research links. This website is a splendid resource on plants.