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Which option best identifies the exact concept boundary for Variation and evolution, Variation: students must explain how a rare mutation producing a suitable new phenotype can lead to a relatively rapid change in a species.
- A.Definition boundary: Mitosis produces identical cells; meiosis produces genetically different gametes. This matches Variation because students must explain how a rare mutation producing a suitable new phenotype can lead to a relatively rapid change in a species.
- B.Scale confusion: Claiming mitosis produces gametes. This would blur Mitosis vs meiosis instead of testing Variation.
- C.Process confusion: Forgetting chromosome number is maintained in mitosis but halved in meiosis. This misses the objective focus on explain how a rare mutation producing a suitable new phenotype can lead to a relatively rapid change in a species.
- D.Evidence confusion: It moves into a neighbouring Unit 4.6 idea rather than Variation and evolution / Variation.
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