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Describe briefly four ways in which individuals with a particular trait may increase in a population.

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The four ways in which individuals with a particular trait may increase in a population are as follows:

(i) Sexual reproduction results into variations.

(ii) The individuals with special traits survive the attack of their predators and multiply while the other will perish.

(iii) Geographical isolation: It leads to change in gene frequency leading to expression of one type of traits in a geographically isolated population.

(iv) Migration: It leads to flow of a particular type of gene in a specified population.

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