Discuss the role of different patterns of selection in evolution.

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Detailed Solution

Natural Selection is mainly of three types namely:
a) Stabilising selection
b) Directional Selection
c) Disruptive selection

a) Stabilising selection:

This selection operates in a stable environment.
The organisms with average phenotype are selected and organisms with extreme phenotypes are removed.

b) Directional Selection:

This selection operates in gradually changing environment.
It removes the individuals from one end of the phenotype and selecting the individuals towards the other end of the phenotype.

c) Disruptive selection:

This selection operates in rapidly changing environment.
The organisms with extremes of the phenotype are selected and organisms with average of the phenotype are removed.

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