A kind of natural force that compels the evolution of a population towards one end of the spectrum of traits is known as directional selection. There are two types of traits i.e., discrete and continuous. The discrete traits have specified variations whereas those which are present in a wide range and comprise numerous values are termed as continuous traits.
If the discrete trait is objected to directional selection, then there would only be a single variation. On the other hand, in the case of continuous traits, either the lowest or the highest value is selected. If this phenomenon exists in a population over time, the selected traits would increase and ultimately lead to the process of evolution.
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