Students will get out their homework assignment for the previous lesson: "An Introduction DNA". Students were to respond to the prompt: "How does the structure of the DNA model that the class assembled during today's lesson determine the structure of the proteins that will be created? " at home to reinforce the previous lesson's content.
Students will watch the video clip, take notes on interesting facts from the video, and then have the opportunity to edit their homework response to more accurately describe the relationship between DNA sequences and protein structure. After students have revised their responses, they will switch papers with their partners to review each other's work and offer constructive feedback to fine tune their statement. Students can elect to implement their partner's ideas into their response statement or leave their work as is.
DNA Video Notes - Student Samples - Some students took the opportunity to record ample amounts of notes by expanding on their prior knowledge of DNA, while others kept it simple and only included information from the short video clip.
Students will watch the video clip as an introduction to today's laboratory activity.
Students will read and review the Berry Full of DNA Lab Procedure. The teacher will visually guide students through the multi-step procedure to support student learning by demonstrating each of the steps in the front of the classroom.
Safety Warnings: Students will be using alcohol (either isopropyl or ethanol) which is flammable and irritating to skin. Students must wear goggles during the lab activity and wash their hands with soap and water at the end of the experiment.
Cool Facts - Strawberries are octoploidà meaning they have 8 of copies of each chromosome. Since they have such an enormous genome they are perfect for this lab!
Students will use the Lab- Berry Full of DNA-student sheet to record their observations and responses that are associated with the DNA Extraction Lab.
Student Samples - Berry Full of DNA Lab - Students had a great time completing the laboratory activity, but many struggled in their detailed responses to the comprehension questions. The student work samples demonstrate the need to review with the students regarding the practical applications of DNA knowledge.
Once the students have completed the extraction, they will work with their partner to clean up their supplies and then answer the conclusion questions.
Students will work in collaborative pairs to respond to the following questions:
Homework-Reinforcing Activity: Students will go to the Genetic Science Learning Center website and explore the plethora of information, demonstrations, and animations that support student understanding of DNA and protein synthesis. Students will take a page of notes to highlight information that they found interesting, information that they found interesting, and information that they would like to learn more about.