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Directional selection :...

Directional selection `:`

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Assertion Directional selection operates in response to gradual changes in enviromental conditions Reason Stabilising selection operates when phenotypic features coincide with the optimal environmental conditions

Assertioin Industrial melanism is an example of disruptive selection Reason Evolutionary change in moth is provided by the response of moth species to the directional selection pressure produced by the atmospheric pollution

Assertion (A ) : The long neck of giraffe is due to centripetal selection. Reason (R ) : During directional selection when the mean value of phenotype coincide with new optimum environmental conditions. Centripetal selection takes over.

Differentiate between Directional natural selection and Disruptive natural selection.