Summary and Exam Tips for Genetic Modification (Genetic Engineering)
Genetic Modification (Genetic Engineering) is a subtopic of Use of Biological Resources, which falls under the subject Biology in the Edexcel IGCSE curriculum. Genetic engineering involves altering the genetic material of an organism by removing, changing, or inserting genes from another organism. The recipient organism is termed as a genetically modified or transgenic organism, and the resulting DNA is known as recombinant DNA. Examples include bacteria modified to produce human insulin for diabetics and crop plants like wheat and maize engineered to resist insect pests by incorporating bacterial genes. Additionally, crops have been modified to resist herbicides and enhance nutritional content, such as golden rice enriched with vitamin A. The process involves isolating the desired gene using restriction enzymes, inserting it into a bacterial plasmid, and using DNA ligase to form recombinant DNA. Bacteria are ideal for genetic engineering due to their universal genetic code, lack of ethical concerns, and the presence of easily manipulated plasmids.
Exam Tips
- Use specific Biology terms: Avoid vague words like "it" or "they" without clear references. Precision is key.
- Understand the question: Differentiate between 'what' and 'why' questions to provide accurate answers.
- Mark allocation: Let the number of marks guide the depth of your response.
- Clarity and relevance: Ensure your answers are clear and directly related to the question asked.
