AQA · Biology · 8461
GCSE Biology: Evolution
Inheritance, variation and evolution · AQA GCSE Biology (8461), specification point 4.6.2.2. Cards are generated from the exam board's own specification for "Evolution", and every card links back to the page it came from. Specification © AQA — used with attribution.
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Define evolution.
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A change in the inherited characteristics of a population over time through the process of natural selection.
Which process drives evolutionary change in a population?
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Natural selection.
What may evolution by natural selection eventually result in?
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The formation of a new species.
From what did all living species evolve, according to the theory of natural selection?
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Simple life forms.
How long ago did the first simple life forms develop on Earth?
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More than three billion years ago.
Natural selection favours variants that give rise to ? best suited to their environment.
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phenotypes
Why are some variants selected for during natural selection?
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Their phenotypes are best suited to the environment, so they are more likely to survive and reproduce, passing on their characteristics.
When have two populations of one species become two new species?
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When their phenotypes have become so different that they can no longer interbreed to produce fertile offspring.
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