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. - Stabilizing selection acts in the absence of large scale environmental change, the therefore, it keeps a population genetically constant. - Directional or progressive selection produces a regular change within a population in one direction in respect to certain characteristics. This is due to 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 varience within populations.
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