Year 11 - Science
Mutations and evolution in bacteria
Variation and natural selection at the genetic level
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This pupil-friendly study guide includes a unit summary, clear notes, common mistakes, and quick questions with answers.
Unit Summary
This unit covers genetic variation, comparing asexual and sexual reproduction. It explores mutations' impact on phenotypes, evolution through natural selection, and how scientific theories develop, explaining how advantageous traits lead to adaptation.
Lesson Summary
You will learn to describe examples of mutations in bacteria and explain why advantageous genetic variants became more common in the bacterial population.
Key Notes
- An example of a mutation in bacteria that could be helpful to humans (e.g. ability to digest man-made waste).
- An example of a mutation in bacteria that is dangerous to humans (e.g. antibiotic resistance).
- Explanations of examples at the genetic level using ideas about mutation, natural selection and asexual reproduction.
- Explanations to include why advantageous genetic variants become more common in the bacteria over generations.
Vocabulary To Learn
- natural selection: Organisms that are better adapted to their environment are more likely to survive, reproduce and pass on their genes to their offspring.
- micro-organism: Microscopic living thing, such as a bacterium or an amoeba.
- mutation: A change in the nucleotide base sequence in the DNA of the genome.
- genetic variant: A region of DNA in which the sequence of nucleotide bases has been changed.
- asexual reproduction: A form of reproduction in which a cell divides to produce two genetically identical cells.
Common Mistakes To Avoid
- Pupils may think that bacteria are not living organisms and/or do not evolve. Pupils may also think that all bacteria are harmful.
3 Quick Questions (With Answers)
1. Explain the scientific idea in this lesson using two key points.
An example of a mutation in bacteria that could be helpful to humans (e.g. ability to digest man-made waste). An example of a mutation in bacteria that is dangerous to humans (e.g. antibiotic resistance).
2. Define this scientific word and use it in context. 'natural selection'
Organisms that are better adapted to their environment are more likely to survive, reproduce and pass on their genes to their offspring. Include the word in a full scientific explanation, not as a single label.
3. Correct this common scientific misunderstanding.
Mistake: Pupils may think that bacteria are not living organisms and/or do not evolve. Pupils may also think that all bacteria are harmful. Correction: The lesson explores two examples of evolution in bacteria, explaining each example through mutation, reproduction and natural selection.
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