Variation — Difficult
Transfer your understanding to a changed context, justify decisions and check your reasoning. No hints during the test.
Includes extension practice
Variation categories and mutation as the source of new alleles are required. Detailed mutation-rate causes and separate meiosis/random-mating/random-fertilisation mechanisms go beyond the stated list.
Easy, Normal and Difficult describe practice demand; they are not the official Core and Extended tiers.
- Cambridge 0973 syllabus2028–2029 · B17.1.1–5
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