Genetic Engineering — GCSE Biology Revision
Revise Genetic Engineering for GCSE Biology. Step-by-step explanation, worked examples, common mistakes and exam-style practice aligned to AQA, Edexcel, OCR, WJEC, Eduqas, CCEA, Cambridge International (CIE), SQA, IB, AP.
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Next step: Cloning
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Go to CloningWhat is Genetic Engineering?
Genetic engineering is a process that involves modifying the genome of an organism by introducing a gene from another organism to give a desired characteristic. It involves using enzymes to cut a desired gene out of one organism and insert it into the DNA of another. This has applications in medicine (e.g., producing insulin) and agriculture (e.g., creating genetically modified crops).
Board notes: Covered by all major boards (AQA, Edexcel, OCR), particularly at the Higher tier. The process of creating a GM bacterium to produce insulin is a classic example.
Step-by-step explanationWorked example
To produce human insulin for diabetics, the gene for human insulin is cut from a human chromosome using a restriction enzyme. The same enzyme is used to cut open a plasmid from a bacterium. The insulin gene is inserted into the plasmid, and this recombinant DNA is put back into a bacterium. The bacterium then multiplies, and all its offspring produce human insulin, which can be harvested and purified.
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Common mistakes
- 1Confusing genetic engineering with selective breeding. Genetic engineering directly manipulates DNA, often between different species, while selective breeding works with natural variation within a species over generations.
- 2Thinking that GM (genetically modified) food is inherently dangerous. While there are concerns about long-term effects and environmental impact, many GM crops are approved as safe to eat.
- 3Forgetting the role of vectors. A vector, such as a bacterial plasmid or a virus, is often used to transfer the desired gene into the target cell.
Genetic Engineering exam questions
Exam-style questions for Genetic Engineering with mark-scheme style solutions and timing practice. Aligned to AQA, Edexcel, OCR, WJEC, Eduqas, CCEA, Cambridge International (CIE), SQA, IB, AP specifications.
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Step-by-step method
Step-by-step explanation
4 steps · Worked method for Genetic Engineering
Core concept
Genetic engineering is a process that involves modifying the genome of an organism by introducing a gene from another organism to give a desired characteristic. It involves using enzymes to cut a desi…
Frequently asked questions
What is a genetically modified organism (GMO)?
A GMO is an organism whose genetic material has been altered using genetic engineering techniques. This could be a plant, animal, or microorganism.
What are the pros and cons of GM crops?
Pros include increased yield, enhanced nutritional value, and resistance to pests or herbicides. Cons include potential long-term health effects, impact on wild ecosystems, and ethical concerns about 'playing God'.