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Q.
Which type of selection is industrial melanism observed in moth, Biston betularia?
Evolution
Solution:
In directional selection, the population changes towards one particular direction. It means this type of selection favours small or large-sized individuals and more individuals of that type will be present in next generation. The mean size of the population changes. Examples are evolution of $DDT$ resistant mosquitoes, industrial melanism in peppered moth and evolution of giraffe