Variation — Normal
Apply the topic independently and explain your method. 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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