Learning objective

Use direct proportion and simple ratios to express outcomes of a genetic cross.

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At a glance

5

Flashcards

7

Questions

Topic

Reproduction

Subtopic

Genetic inheritance

AQA GCSE BiologyInheritance, variation and evolution

Study support

Understand this objective

Short explanation

Use direct proportion and simple ratios to express outcomes of a genetic cross.. Within Reproduction, this learning objective sits inside Genetic inheritance for AQA Biology 8461. Focus on using ideas such as gene, genetic cross, ratios accurately in your explanation. A strong response should define the core idea, describe the relevant biological process, and connect it back to the question wording instead of giving a vague definition. When revising, students should aim to explain the science clearly, include precise biological vocabulary, and show how the process or structure links to the wider topic rather than listing isolated facts.

Key concepts

Direct proportionSimple ratio

Why it matters

This objective helps connect Genetic inheritance to exam-style questions, flashcards, and revision notes for Reproduction.

Common mistakes

1 linked
  • Misinterpreting Ratios as Percentages: Explain that a ratio shows the relative frequency of each genotype or phenotype, not a proportion of 100. Use the ratio 1:2:1 directly, or convert it to percentages by dividing each part by the total (4) and multiplying by 100, giving 25%:50%:25% only after the conversion step.

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