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Learning objective

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

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Topic

Reproduction

Subtopic

Genetic inheritance

Aqa Gcse BiologyInheritance, variation and evolution

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Quick explanation

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

  • This point belongs to Reproduction, especially Genetic inheritance.
  • You need to be able to use direct proportion and simple ratios to express outcomes of a genetic cross.
  • The key ideas to know are gene, ratios, and genetic cross.
  • Use the linked flashcards and practice questions to check recall, then practise applying the idea in an exam-style answer.

Key concepts

generatiosgenetic cross

Why it matters

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

Quick student answer

How do you use direct proportion and simple ratios to express outcomes of a genetic cross in exam questions?

Direct answer

In Biology, this page helps you answer questions about direct proportion and simple ratios to express outcomes of a genetic cross within Reproduction. Focus on the key process, correct scientific terms, and how the idea links to exam-style questions. Key terms to check are Direct proportion and Simple ratio.

Key terms

  • Direct proportion: A relationship in which the ratio of two quantities remains constant, used to predict the relative frequencies of genotypes or phenotypes in a genetic cross.
  • Simple ratio: A comparison of two or more numbers expressed as a fraction or whole numbers, applied to describe the expected proportions of outcomes in a genetic cross.

Common trap

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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