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What are the different ways in which ind...

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 :
a. Natural selection: When that trait offers some survival advantage.
b. Genetic drift: When some genes governing that trait become common in a population .
c. When that trait gets acquired during the individual.s lifetime.
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