Notes for D1.3.7 Mutation as a source of genetic variation - IB | RevisionDojo
D1.3.7 Mutation as a source of genetic variation Notes
How Mutations Create Genetic Variation
Definition
Mutation
A mutation is a change in the DNA sequence, which can alter the instructions for building proteins or regulating cellular processes.
Mutations alter the DNA sequence, creating new alleles.
These new alleles introduce variation within a population.
Without mutations, all individuals would be genetically identical, leaving no room for adaptation.
Example
Imagine a population of beetles living in a forest.
Most are green, blending perfectly with the leaves, but a few are brown due to a genetic change.
One day, a fire sweeps through, turning the forest floor dark.
Suddenly, the brown beetles are better camouflaged, making them less likely to be eaten by predators.
Over time, the brown beetles thrive, and their population grows.
Practical Implications: Genetic Testing
Modern technology allows us to identify mutations in our DNA through genetic testing.
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Questions
Recap questions
1 of 5
Question 1
Recap question
To minimize misunderstanding and misuse of genetic testing results in a healthcare setting, which policy measure is most effective?
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What would happen to a population without mutations?
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Note
A mutation is a change in the DNA sequence, which can alter the instructions for building proteins or regulating cellular processes.
