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Description of Unit

In this task, seventh-grade students will study the genetics behind genetically modified organisms (GMOs), work collaboratively to understand a real-world problem, use mathematics and research to develop an argument, and use technology to present a solution.

This guide links the GM-OH unit to the Texas Essential Knowledge and Skills (TEKS) for seventh graders. GM-OH is a science unit that puts students into a real-life scenario where they must make a recommendation to the school board about the purchase of genetically modified foods for school lunches. Though a problem-based science unit, GM-OH also teaches students skills in English language arts, mathematics, social studies, and technology. For example, students will use research skills to understand a problem and develop possible solutions. The following document includes the applicable TEKS and the details of the GM-OH unit. The final section of this document presents the applicable Texas College and Career Readiness Standards adopted by the Texas Higher Education Coordinating Board (THECB) on January 24, 2008.

Phase I. Learning Experiences

Teacher Notes: If you are not familiar with the issues involved in the genetically modified organism (GMO) debate, you might want to listen to the podcast “Science Vs. GMO” (https://gimletmedia.com/shows/science-vs/gmhnb3/gmo-omg). This 27-minute podcast gives an overview of the entire GMO issue, including the history and current science. The podcast is not really pro-GMO in nature, but it does use science to deflect many of the myths about GMOs.

Before undertaking this unit of study, students should have already studied cell structures and cell theory.

  1. What is Selective Breeding?
    Students will begin the unit by thinking of a living organism that has been bred to improve a characteristic. The students will share this organism with the class and create a mind map to answer the following questions:

    • What specific characteristic is this organism bred for?
    • Are household pets bred for specific characteristics?
    • Are certain flowers bred for specific characteristics?
    • Do you think it is right to breed organisms for specific characteristics?

    There are many free and collaborative mind map tools available online for students to use (e.g., https://www.mindmup.com/, https://bubbl.us/). Students should create a mind map that lists the type of animal and the specific characteristics each was bred for. This can also be done with fruits and vegetables.

    Teacher Notes: Examples of selective breeding can be found in almost all agricultural products (e.g., cows that provide more milk and meat; larger Thanksgiving turkeys; giant tomatoes and strawberries). You might want to show the class some examples, such as a wild strawberry next to a domesticated one or a wild turkey compared to a turkey raised on a farm.

    Ask students if they have ever heard of a Labradoodle dog (i.e., a mix of a Labrador retriever and a poodle). Conduct a short class discussion to promote deeper thinking about this introductory topic. You may select the discussion strategy that will work best for your class (https://www.cultofpedagogy.com/speaking-listening-techniques).

  2. What are Genotypes?
    CK12.org provides 12 resources for introducing students to the concepts of Mendellian Genetics. Some of these resources are articles, some are interactives, and some are study guides (https://www.ck12.org/search/?q=Mendels%20laws%20and%20genetics&source=ck12&subject=biology).

  3. Practicing with Punnett Squares
    Have students watch a 15-minute video on Gregor Mendel and the beginning of genetics (https://www.ck12.org/life-science/Punnett-Squares-in-Life-Science/rwa/Of-Monks-and-Peas/?referrer=concept_details). Punnett squares are a fairly simple way to calculate the probability of an organism having a specific trait.

    Have students read, watch the video, and then complete the background information provided on Punnett Squares (https://www.ck12.org/life-science/Punnett-Squares-in-Life-Science/lesson/Punnett-Squares-MS-LS/).

    There are other online Punnett Square labs similar to the ones above. Check to see if your science textbook has a virtual lab.

Phase II. Independent Research

A. Research process

  1. Choosing a topic. Students are presented with a letter from the school board asking them to be on a committee (see the “Sample Letter” attachment). The purpose of the committee is to make a recommendation at the next school board meeting on whether the school district should purchase genetically modified potatoes and corn for school lunches in the next school year. The students’ recommendation is due in one week.

    Student Groupings: Students will be placed in groups of four or five students with roles as follows:

    Student 1
    Concerned parent: This parent is worried that his or her children will accidentally be poisoned by GMOs. This person is neither for nor against genetically modified (GM) foods.

    Student 2
    Environmentalist: This person does not trust GMOs and feels that they are created by Big Business as a way to make money. This person is against GM foods.

    Student 3
    Local farmer: This farmer uses GM seeds to grow crops each year. This person is neither for nor against GM foods. The farmer only wishes to produce as much food as possible to maximize his or her profits each growing season.

    Student 4
    Geneticist from a local university: This person works in a lab creating genetically modified organisms. This person is for GM foods.

    Student 5
    Student: This person will have to eat the food produced in the cafeteria. The student is neither for nor against GM foods.

    Teacher Notes: Explain to students that all of these people can have their positions changed by the end of the task. The student has to keep in mind the position of the stakeholder to ensure that his or her point of view or concerns are being considered in the solution.

    The more official your letter looks to your students, the more interest they will have in the problem. Teachers could consider using actual school board members’ names (with permission) on school district letterhead. You may also want to let your administrator know about the lesson ahead of time so that they are aware of the scenario the students will be playing out in class.

  2. Asking guiding questions. Guiding questions have been provided for each stakeholder in this scenario.

    Student 1
    Concerned parent: This parent is worried that his or her children will accidentally be poisoned by foods that contain GMOs. This person is neither for nor against genetically modified (GM) foods. Guiding questions may include the following:

    • Does using each type of organism have a possible impact on human health?
    • What is the current scientific consensus on the safety of GM foods?

    Student 2
    Environmentalist: This person does not trust GMOs and feels that they are created by Big Business as a way to make money. This person is against GM foods. Guiding questions may include the following:

    • What are some of the impacts on the natural environment caused by using these types of organisms?
    • Does using each type of organism have a possible impact on human health? How do you know?
    • Are there possible impacts on other agricultural products in the area that could be caused by using each type of organism?
    • Are these organisms being grown near our city?

    Student 3
    Local farmer: This farmer uses GM seeds to grow crops each year. This person is neither for nor against GM foods. The farmer only wishes to produce as much food as possible to maximize his or her profits each growing season. Guiding questions may include the following:

    • Are there current laws and regulations governing the use of each type of organism?
    • Where are GM potatoes and corn grown?
    • What are some common plant-breeding techniques used in agriculture that are not related to GMOs?
    • Are these organisms being grown near our city?

    Student 4
    Geneticist from a local university: This person works in a lab creating genetically modified organisms. This person is for GM foods. Guiding questions may include the following:

    • What is the difference between an organic organism, a non-GMO, and a GMO?
    • What are some of the benefits and disadvantages of using organic organisms, non- GMOs, and GMOs?
    • What is the current scientific consensus on the safety of the use of GM foods?

    Student 5
    Student: This person will have to eat the food produced in the cafeteria. The student is neither for nor against GM foods. Guiding questions may include the following:

    • How much of a typical school lunch includes potato or corn products?
    • Do other cafeteria foods (e.g., breakfast items, snacks) contain potato or corn products?
  3. Creating a research proposal. After being presented with the problem letter and being assigned a role, students begin to narrow the problem that needs to be solved. In a large group, students create a chart that lists what they know, what they need to know, and what they think they know. This is a brainstorming session, and all questions should be allowed. Students should have more questions about what they need to know than what they already know.

    After giving students a sufficient amount of time to develop this chart, they should review the list of what they need to know and identify the top three to five questions. Those questions will be the basis for the unit. Teachers should monitor the list of what they need to know to make sure that the questions are related to the learning. For instance, students might ask the question, “What is a school board?” While that might seem important, it is not truly related to the outcome of this task. The teacher should gently direct them towards topics relevant to GMOs.

    By the end of this section, students should have three to five questions related to GMOs that need to be answered. The questions students develop in this section are the basis for learning. Typical questions should look something like the following:

    • What is a genetically modified organism (GMO)?
    • Who makes GMOs?
    • Are GMOs safe for students to eat?
    • How long have GMOs been around?
    • Who is using GM foods now?
    • Are we eating GM foods without our knowledge?
    • How are GM foods made?
  4. Conducting the research. Based on the role that they are playing, students will use basic research techniques and begin gathering information on GMOs. Students can work with other students in the same role to gather information. For instance, all the environmentalists can work together and all the concerned parents can work together. This information will be used back in the groups to convince fellow committee members.

    Resources for teachers and students:

    During this process, student jigsaw groups will be collecting primary and secondary sources to help build their knowledge base and justify their recommendations. Primary sources may include interviews with experts in the field. All sources used must be documented in a formatted bibliography. Primary and secondary sources must be identified and listed separately.

    Teacher Notes: If at all possible, the teacher should make arrangements for students to conduct interviews with experts in the field. Experts can include farmers, biology professors, environmentalists, or industry leaders. Experts do not have to be physically present. Consider using telecommunication or videoconference programs to contact experts who may not be available to actually come to your school.

    Students may also use a collaborative spreadsheet (e.g., Office 365, Excel, Google Sheets, Apple Numbers) to complete their chart on what they need to know. Teachers can set up the chart prior to class and share it with students. Simply make a sheet with three headings: What We Know; What We Need to Know; and What We Think We Know. If teachers make a sheet for each class, students can later refer to what other classes are working on and expand the conversation outside of class. Students in each role can also create shared collaborative documents where they can share their research.

B. The product

After the research has been completed, it is time for the jigsaw members to return to their original groups and present the information they have learned. Before they return to their groups, have each group revisit their chart on what they need to know:

  • Are there any questions that they would now add to the chart?
  • Were there questions that now seem too easy to answer?
  • What would be some ways to extend this learning?
  • Are there deeper questions that could be added here?

This is also a good time to check and see that students have stayed on topic and researched material based on the role that they have been given. Has the concerned parent stayed essentially neutral in his or her research? Has the environmentalist stayed against GMOs? Has the geneticist stayed for GMOs?

Once students return to their original groups, they will begin presenting the information that they learned from their research and the stand that they are taking on the topic. Each member is given equal time to explain his or her viewpoint, and then the group will be asked to come to a consensus about the recommendations that they will be making to the school board. Each presentation should not last any longer than five minutes. There should be a few minutes of Q&A after each presentation. Teachers can use the Q&A to check for deeper understanding.

Teachers can add authenticity to the project by having adults act as the school board. They can ask questions directly to students after the five-minute presentation.

C. Communication

Mock School Board Presentation: Teachers should check that the presentation showed alignment to the TPSP rubric in a variety of ways, including the following:

  • Developed a comprehensive response to the topic
  • Used a variety of sources that accessed advanced content and included multiple perspectives
  • Collected information using the tools of the discipline
  • Analyzed and interpreted information and data
  • Communicated research findings, learning, and ideas to an audience using the language of the discipline

Students will construct their school board presentations. The students can use a wide variety of presentation tools (e.g., PowerPoint, Google Slides, Apple Keynote, Press). Students might also consider non-traditional presentation tools, such as Microsoft SWAY.

D. A completed project consists of:

  1. A completed question and research chart
  2. A bibliography of primary and secondary resources
  3. A Mock School Board Presentation
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