Edexcel IGCSE Biology · Spec 3.34-3.37B
Mutation (Triple)
Mutations and mutagens, and how they can lead to variation and to cancer.
Biology revision video
Mutation (Triple)
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Spec 3.34-3.37B
What you need to know
- Recall what a mutation is
- Explain how a mutation can change the phenotype
- Know that most mutations have no effect
Active recall
Quick check
Answer each question before opening the answer.
How can a mutation change a protein?
It changes the base sequence, which may change the amino acid sequence, producing an altered or non-functional protein.
Are most mutations harmful?
No — most are neutral (no effect), some are harmful, and rarely one is beneficial.
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