Cloning — GCSE Biology Revision
Revise Cloning 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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Go to Natural Selection & EvolutionWhat is Cloning?
Cloning is the process of creating a genetically identical copy of an organism. This can happen naturally, as with identical twins, or artificially. Methods include taking cuttings from plants, and in animals, embryo transplants and adult cell cloning (the method used to create Dolly the sheep).
Board notes: Covered by all major boards (AQA, Edexcel, OCR), particularly at the Higher tier. The methods for plant and animal cloning, and the associated ethical issues, are key.
Step-by-step explanationWorked example
To clone a plant, a gardener can take a cutting – a small piece of the stem or leaf. When this cutting is planted in soil or water, it can grow into a new, complete plant that is genetically identical to the parent plant. This is a simple and common form of artificial cloning.
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Common mistakes
- 1Thinking clones are always created in a lab. Many plants and some simple animals clone themselves naturally as a form of asexual reproduction.
- 2Confusing cloning with genetic engineering. Cloning produces a genetically identical copy of an entire organism, whereas genetic engineering involves altering specific genes within an organism.
- 3Believing that a clone will be identical in every way. While the genetics are the same, environmental factors can cause differences in the phenotype, and a clone will not have the same memories or personality.
Cloning exam questions
Exam-style questions for Cloning 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 Cloning
Core concept
Cloning is the process of creating a genetically identical copy of an organism. This can happen naturally, as with identical twins, or artificially. Methods include taking cuttings from plants, and in…
Frequently asked questions
How was Dolly the sheep cloned?
Dolly was created using adult cell cloning. The nucleus was removed from an unfertilised egg cell and replaced with the nucleus from an udder cell of the sheep to be cloned. The reconstructed embryo was then implanted into a surrogate mother.
What are the risks of cloning animals?
Cloning animals has a very low success rate and can lead to health problems and premature aging in the cloned offspring. There are also ethical concerns about animal welfare and the potential for misuse in humans.