A) directional
B) disruptive
C) not acting
D) stabilizing
Correct Answer: D
Solution :
Natural selection creates new adaptive relations between population and environment by favouring some combinations and constantly moulding and modifying the gene pools. Stabilising selection aets in the absence of large scale environmental change, therefore, it keeps a population genetically constant. Directional or progressive selection produces a regular change within a population in respect to certain characteristics. This is due to the change in the environment in a particular direction. Disruptive or diversifying selection acts to break up a previously homogeneous population into several different adaptive norms. Therefore, it tends to increase the amount of variance within populations.
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