KS4 / GCSE · Biology
Inheritance, Variation and Evolution
What is it
Students study DNA structure, genes and alleles, monohybrid inheritance and Punnett squares, causes of variation, evolution by natural selection, evidence for evolution, genetic engineering, and classification.
Why it matters
This topic combines genetics maths (Punnett square ratios) with Darwin's evolutionary theory, making it one of the most calculation-heavy and conceptually rich parts of GCSE biology.
Exam tip
Practise Punnett square questions until the 3:1 and 1:1 ratios are second nature — genetics calculation questions are guaranteed on every paper and are pure, learnable technique rather than memorisation.
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