Form 5 · Paper 2 essay guide

Genetic Technology, Paper 2 essay guide

How Genetic Technology appears in Paper 2 essays: themes, a planning grid, a model answer structure and the keyword list.

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Essay themes this chapter supports

Explaining genetic engineering using the production of insulin as a worked example: Define genetic engineering and state how it differs from selective breeding. → Explain recombinant DNA and the role of a plasmid as a vector. → Describe the steps of producing human insulin using bacteria. → State the advantage of this method over extracting insulin from animal organs. → Note that this general sequence underlies other genetic engineering applications.
Explaining biotechnology as a field wider than genetic engineering: Define biotechnology as the use of living organisms, cells or their products for a practical purpose. → Give a traditional example, such as fermentation, that predates genetic engineering. → Describe a modern example, such as enzyme technology or a genetically modified crop. → Explain that genetic engineering is one modern branch within the wider field of biotechnology. → Explain why an exam question might ask for a biotechnology example that is not genetic engineering.
Weighing the benefits and ethical concerns of genetic technology: State a specific benefit of genetic technology with a named example. → State a specific concern of genetic technology with a named example. → Explain why a balanced answer is expected rather than a one-sided view. → Discuss unequal access between wealthier and poorer countries as an ethical dimension. → Conclude by linking back to how each application should be judged on its own merits.
Comparing gene therapy, DNA fingerprinting and cloning as related applications: Define gene therapy and state that it targets specific cells rather than the whole body. → Define DNA fingerprinting and explain that it changes no gene at all. → Distinguish reproductive cloning from therapeutic cloning. → State one feature shared by all three applications and one key difference in purpose. → Give one named example for each application.

How to structure your essay

Open with one or two sentences that define the topic and set the scope.
Devote one paragraph to each key concept, in a logical order.
Use precise biological terms and, where relevant, a labelled diagram.
Give an example or state where the process happens in the body or plant.
Close by linking the ideas back to the question.

Planning grid

Question	Answer
Introduction	State what the question asks and define the key term it uses, such as 'genetic engineering', 'biotechnology' or 'cloning', in one sentence.
Point 1	Name the technique or application involved and state its defining feature, such as its purpose or the structure it depends on.
Point 2	Develop the explanation the question asks for, such as the steps of a process, a comparison, or a benefit and concern.
Point 3	Support the answer with a specific named example, such as insulin production, Bt cotton or the sheep Dolly, explained fully rather than only named.
Conclusion	Draw the ideas together, linking the point back to its significance, such as medical benefit, food security, or the need for individual regulation.

Key terms to include

genetic engineering
selective breeding
recombinant DNA
plasmid
vector
insulin
Bt cotton
herbicide tolerance
biotechnology
fermentation
enzyme technology
benefit
ethical concern
gene therapy
DNA fingerprinting
reproductive cloning
therapeutic cloning
genetically modified crop
host cell
gene

A model essay outline

Genetic engineering, Genetic engineering is the deliberate, direct alteration of an organism's genes in the laboratory, most often by transferring a useful gene from one organism into another so the recipient gains a new characteristic it did not have before. This differs from selective breeding, which only works with genetic variation that already exists in a population. The transferred gene can come from a bacterium, a plant or an animal, and it is moved across species boundaries for a specific purpose.
Recombinant DNA, Recombinant DNA is formed by cutting a gene from one source and joining it into DNA from another, often a bacterial plasmid, using specific enzymes. Once inserted into a host cell, the recombinant DNA is copied and read along with the host's own genes. The plasmid acts as a vector, a carrier that ferries the new gene into the host and allows it to be copied whenever the host cell divides.
Applications, Practical applications include bacteria engineered to produce human insulin and growth hormone, crops modified for pest resistance, herbicide tolerance or improved nutrient content, and enzymes engineered for use in industrial processes such as detergents and food production. Each application starts from the same basic technique: identifying a useful gene, then transferring and expressing it in a new host. Bt cotton, for example, is engineered to produce a natural toxin against a specific pest caterpillar, making it one of the most widely grown genetically modified crops in the world.
Biotechnology, Biotechnology is the broader use of living organisms, cells or their products for a practical purpose, and includes traditional processes such as fermentation for bread and yoghurt alongside modern techniques such as genetic engineering and enzyme technology used at an industrial scale. Genetic engineering can therefore be described as one modern branch within the wider field of biotechnology, not a separate subject.
Benefits, Benefits include cheaper, more reliable production of medicines such as insulin and vaccines, higher and more resilient crop yields that support food security, and new treatments for some genetic diseases through approaches such as gene therapy. Industrial enzymes produced through biotechnology can also make manufacturing processes faster and use less energy.

Frequently asked questions

What is genetic engineering?

Genetic engineering is the deliberate changing of an organism's genes, usually by taking a gene from one organism and inserting it into another so that the second organism gains a new characteristic. For example, the human gene for insulin can be put into a bacterium, which then produces human insulin. It is done directly in the laboratory, unlike selective breeding. This lets scientists transfer a characteristic across very different species, something impossible to achieve through natural breeding.

How is insulin produced using bacteria?

The human gene that codes for insulin is cut out and inserted into a small circle of bacterial DNA called a plasmid, forming recombinant DNA. The plasmid is put back into a bacterium, which is then allowed to reproduce. As the bacteria multiply, they read the human gene and produce human insulin, which is collected and purified for use by people with diabetes.

What are the concerns about genetic technology?

Genetic technology brings clear benefits such as medicines and improved crops, but it also raises concerns. These include possible effects on human health, unknown long-term effects on the environment and other species, and ethical questions about how far it is right to change living things. A good answer weighs the benefits against these concerns rather than taking only one side, and names a specific example for each point instead of speaking only in general terms.