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Cambridge IGCSE Biology practice

Paper 3 structured question: Variation

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Variation

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Paper 3Theory (Core)1 marks

Effects of mutagens on mutation rate

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Mutagens and mutation rate

Certain chemicals called mutagens can increase the mutation rate by causing changes in DNA structure or sequence.

  1. a

    Identify one type of chemical that can increase mutation rate.

    Aim for approximately 1 distinct marking point.

    [1]

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Paper 3 structured question: Variation

Paper 3Theory (Core)1 marks

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Mutation rate and environmental factors

Mutations can occur naturally but certain environmental factors increase their frequency. Ionising radiation and some chemicals are known to raise the mutation rate by damaging DNA.

  1. a

    State one factor that can increase the mutation rate.

    Aim for approximately 1 distinct marking point.

    [1]