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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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The various ways in which individuals with a particular trait may increase in a population are :
(i) By the process of natural selection in which the charactaristics that help individual organisms to survive and reproduce are passed on to their offsprings, and those characteristics which do not help are not passed on.
(ii) By the process of genetic drift caused by drastic changes in the fraquencies of particular genes by chance alone.
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