Learning objective
Explain how mutations can affect phenotype.
Read the explanation, check the common trap, then practise with flashcards and questions.
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Topic
Control of gene expression official content
Subtopic
Alteration of the sequence of bases in DNA can alter the structure of proteins
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Quick explanation
Explain how mutations can affect phenotype
- This point belongs to Control of gene expression official content, especially Alteration of the sequence of bases in DNA can alter the structure of proteins.
- You need to be able to explain how mutations can affect phenotype.
- The key ideas to know are mutation and phenotype.
- Use the linked flashcards and practice questions to check recall, then practise applying the idea in an exam-style answer.
Key concepts
Why it matters
This objective helps connect Alteration of the sequence of bases in DNA can alter the structure of proteins to exam-style questions, flashcards, and revision notes for Control of gene expression official content.
Quick student answer
Which of the following mutations is most likely to result in a nonfunctional protein?
Direct answer
A nonsense mutation introduces a premature stop codon, leading to a truncated and often nonfunctional protein.
Key terms
- Phenotype: The observable physical or biochemical characteristics of an organism, determined by both genetic makeup and environmental influences.
- Mutation: A change in the nucleotide sequence of an organism's DNA, which can lead to changes in phenotype.
Common trap
Confusing types of mutations: Remember that missense mutations change one amino acid, while nonsense mutations introduce a stop codon.
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Revision notestopic notes
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Open revision notesRelated learning objectives
- Explain how base-sequence changes can alter amino acid sequences.
Alteration of the sequence of bases in DNA can alter the structure of proteins
- Relate altered amino acid sequences to protein structure and function.
Alteration of the sequence of bases in DNA can alter the structure of proteins
- Interpret mutation information in unfamiliar contexts.
Alteration of the sequence of bases in DNA can alter the structure of proteins
- Explain that cell specialisation results from translation of only part of the DNA.
Most of a cell's DNA is not translated
- Distinguish totipotent, pluripotent, multipotent and unipotent cells.
Most of a cell's DNA is not translated