plumiIsolating mechanisms and speciation: OCR A‑Level Biology A questions
OCR A-Level Biology A past-paper questions on 6.1.2.5 Isolating mechanisms and speciation, 2016–2025, with mark schemes and examiner’s reports where available.
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Q4(b)(iii)
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All 5 questions on Isolating mechanisms and speciation, as a list
- June 2023, Paper 3, Q4(b)(iii) (4 marks): The kakapo and two other species of bird, the kaka and the kea, evolved from a common ancestor approximately 70 million years ago. The evolutionary timeline of
- November 2021, Paper 2, Q20(b)(i) (1 mark): Name the type of speciation that occurs when two populations live in the same location. [1]
- November 2021, Paper 2, Q20(b)(ii) (1 mark): Suggest how G. fortis with large beaks could become reproductively isolated from G. fortis with small beaks despite living in the same location. [1]
- June 2018, Paper 2, Q20(c)(ii) (4 marks): When the island of Madagascar became separated from the African continent, there were no members of the cat family, Felidae, on the island. Outline how a fossa
- June 2018, Paper 2, Q20(c)(iii) (3 marks): Islands, such as Madagascar, often have species that are different from those on the nearest land mass because they are reproductively isolated. State three oth
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