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Twisting the DNA Helix

Twisting the DNA Helix. Maria Helen de Hitta-Catalan. What are Genetically Modified Food (GMF) ?. Food that contain an added gene sequence Food that have a deleted gene sequence Animal products from animals fed with GM feed Products produced by GM organisms.

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Twisting the DNA Helix

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  1. Twisting the DNA Helix Maria Helen de Hitta-Catalan

  2. What are Genetically Modified Food (GMF) ? • Food that contain an added gene sequence • Food that have a deleted gene sequence • Animal products from animals fed with GM feed • Products produced by GM organisms

  3. Why are food genetically modified? • Genetic modification offers a rapid and precise method of altering organisms as compared to traditional methods that are slow and inaccurate.

  4. Common GM Food • Vegetables • Tomatoes • Potatoes • Rice • Cheese • Meat

  5. How is genetic modification possible? • The components of DNA are the same in all organisms. • Sequences that code for proteins can be moved from one organism to another.

  6. How can DNA be moved from one organism to another? • Find an organism with the desired trait • Isolate the gene sequence that codes for the desired trait • Insert the gene sequence into the genome of the plant cell

  7. How can DNA be moved from one organism to another? • Allow the genetically altered cell to grow into a plant • Allow the plant to propagate

  8. A vector can carry DNA. The vector can be a pellet from a gene gun. Viruses and bacteria can also be utilized to transfer genes. How can DNA be moved from one organism to another?

  9. Sources: • Genetics Science Learning Centerhttp://gslc.genetics.utah.edu/ • The Biology Project – Mendelian Geneticshttp://www.biology.arizona.edu/mendelian_genetics/mendelian_genetics.html • Genetics Education Centerhttp://www.kumc.edu/gec/ • DNA: Heredity and Beyondhttp://library.thinkquest.org/20830/ • Biotechnology: An Information Resourcehttp://www.nal.usda.gov/bic/

  10. So, what do you think about genetically modified food - are they beneficial or harmful?

  11. To find out more, your tasks… Ask good questions, access current and relevant information, analyze the validity of resources and the information, reach consensus with your peers, take action, and explain your stand - all in an effort to answer the question: Are genetically modified foods beneficial or harmful?

  12. Specifically, you need to do the following: • Read articles from Web sites using Internet search engines to find information on genetically modified foods. • Conduct a survey to find out the perceptions of a sample population on GMF. • Choose a stand. Are GMF beneficial or harmful?

  13. Specifically, you need to do the following: • Process the data you gathered using a spreadsheet application. • Present survey results to the class using graphs and tables through a PowerPoint presentation; and • Prepare a brochure that informs the public about GMF and its risks and benefits, which will in a way support your stand.

  14. Your performance will be assessed based on… • how you process information • how you support your point of view • how you effectively communicate your ideas, and • how you collaborate with your peers

  15. How your outputs will be evaluated • You will be working in groups and outputs will be evaluated using the following rubrics: • Multimedia Presentation Rubric and • Brochure Rubric

  16. Remember, • Your individual grade will be equivalent to the grade your group will get for this project. • This project will constitute 25% of your grade for the quarter.

  17. Remember also to… keep an open mind, and try not to reach a conclusion before your investigation is complete.

  18. So, Investigate! Collaborate! Share!

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