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What are the different ways in which individuals with a particular trait may increase in a population?

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What are the different ways in which individuals with a particular trait may increase in a population?

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Individuals with a particular trait may increase in a population as a result of the following:
Natural selection: When that trait offers some survival advantage.
Genetic drift: When some genes governing that trait become common in a population.
When that trait gets acquired during the individual's lifetime.

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