plumiCloning in animals: OCR A‑Level Biology A questions
OCR A-Level Biology A past-paper questions on 6.2.1.2 Cloning in animals, 2016–2025, with mark schemes and examiner’s reports where available.
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Q17(a)
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All 18 questions on Cloning in animals, as a list
- June 2025, Paper 2, Q17(a) (1 mark): Human identical twins are an example of natural animal clones. Suggest why human identical twins do not look exactly identical. [1]
- June 2025, Paper 2, Q17(b)(i) (2 marks): The offspring are not the same sex as the parent. Identify two other reasons why parthenogenesis in Komodo dragons is not an example of cloning. 1 2 [2]
- June 2025, Paper 2, Q17(c)(i) (1 mark): State the property of the cells in the embryo that allows cloning to be successful. [1]
- June 2025, Paper 2, Q17(c)(ii) (1 mark): Embryos from stage 3 above are sometimes frozen for later use. State one advantage to agriculture of freezing embryos from stage 3. [1]
- June 2025, Paper 2, Q17(d)(ii) (1 mark): State why SCNT is more useful than embryo splitting when increasing the population of endangered species. [1]
- June 2025, Paper 2, Q17(d)(iii) (1 mark): Suggest one reason why the health of the cloned Przewalski’s horses is better than that of Dolly the sheep, the first mammal to be cloned by SCNT. [1]
- June 2023, Paper 2, Q16(c) (6 marks): Many organisms undergo asexual reproduction by mitosis. (c)* Asexual reproduction is also known as cloning. Many organisms can be artificially cloned for commer
- June 2022, Paper 3, Q4(b) (3 marks): Both A. aerophoba and S. fasciatum reproduce sexually, but under particular conditions they are both able to reproduce asexually. In asexual reproduction in A.
- June 2022, Paper 3, Q4(c) (6 marks): The sea sponge, Aplysina aerophoba, and the zebra shark, Stegostoma fasciatum, are both animals. (c)* Humans can produce artificial clones of animals. Describe
- November 2020, Paper 3, Q2(d) (1 mark): Mice are often used in laboratory studies to research treatments for heart conditions. These mice are often clones. Suggest one reason why clones are used in th
- June 2019, Paper 2, Q11 (1 mark): Corals are a group of animals that usually live on the sea bed close to the surface of the water. Many corals can reproduce both sexually and asexually. Which o
- June 2019, Paper 2, Q19(a)(i) (2 marks): Describe what is happening at stage A and suggest a practical procedure that could allow this to occur. [2]
- June 2019, Paper 2, Q19(a)(ii) (1 mark): Identify a key difference between the processes between stages A and C and the cloning of Dolly the sheep. [1]
- June 2019, Paper 2, Q19(a)(iii) (1 mark): The frog produced by the process in Fig. 19.1 is not a complete clone of the donor tadpole. Suggest why the cloned frog might not be considered a complete clone
- June 2019, Paper 2, Q19(b)(i) (2 marks): Suggest why the x-axis does not show the age of the donor nuclei. [2]
- June 2019, Paper 2, Q19(b)(ii) (3 marks): Dolly the sheep suffered health problems throughout her life and died at an early age. The donor nucleus that was used to create Dolly came from a sheep that wa
- June 2019, Paper 2, Q19(c)(i) (2 marks): Calculate the percentage of pregnancies that resulted in live births in goats and mice. live births in goats = % live births in mice = % [2]
- June 2019, Paper 2, Q19(c)(ii) (3 marks): Compiling results from different scientists can have problems as their investigations may not have been controlled in the same way. List three factors that shou
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