Nicky taught a lesson on genetic modification, explaining the fundamental processes of DNA manipulation and the use of vectors like plasmids and viruses for inserting genes into organisms. She covered practical applications of genetic engineering, including the production of human insulin using genetically modified bacteria and the development of genetically modified plants for improved food production. The lesson concluded with a discussion of ethical concerns and potential risks associated with genetically modified foods, while emphasizing the importance of understanding both the benefits and drawbacks of genetic engineering.