XX is a type of selection process in evolutio | vedclass

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(B) The correct answer is Directional selection.Natural selection processes are categorized as follows:$(i)$ Stabilizing Selection (Balancing selectio

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Directional selection

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(B) The correct answer is Directional selection.Natural selection processes are categorized as follows:$(i)$ Stabilizing Selection (Balancing selection): This type of selection favours average-sized individuals while eliminating small and large-sized individuals. It reduces variation and,therefore,does not promote evolutionary changes. It maintains the mean value from generation to generation. The graphical curve of the population is bell-shaped.$(ii)$ Directional Selection (Progressive Selection): In this selection,the population changes towards one particular direction. This type of selection favours either small or large-sized individuals,and more individuals of that type will be present in the new generation. Consequently,the mean size of the population changes.$(iii)$ Disruptive Selection (Diversifying selection): This type of selection favours both small-sized and large-sized individuals. It eliminates most of the members with mean expression,producing two peaks in the distribution of the trait,which may lead to the development of two different populations. This kind of selection is the opposite of stabilizing selection and is rare in nature but is very important in bringing about evolutionary changes.

$XX$ is a type of selection process in evolution. $XX$ promotes population changes in one particular direction. $XX$ favours small or large-sized individuals,and the mean size of the population changes in $XX$. Identify $XX$.

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