Edexcel IGCSE Biology · Spec 3.38
Natural Selection
How natural selection works and how it drives evolution over many generations.
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Natural Selection
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Spec 3.38
What you need to know
- Explain Darwin's theory of natural selection
- Describe how a species changes over time
- Use an example to explain evolution
Active recall
Quick check
Answer each question before opening the answer.
Outline the steps of natural selection.
Variation exists → a selection pressure/competition acts → the best-adapted individuals survive and reproduce → their advantageous alleles are passed on.
Who proposed the theory of evolution by natural selection?
Charles Darwin.
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