Plant species produce cysteine protease, which disrupt the

peritrophic membrane that protects the gut epithelium of many insects.

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Directional Natural selection

Directional selection favors individuals at one extreme of a phenotypic distribution that have greater reproductive success in a particular environment.

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1. Resistant to pesticide in insect

2. Antibiotic resistant in pathogen

3. Industrial melanism

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Disruptive Natural selection

Disruptive selection favors the survival of individuals at both extremes of a range, rather than the  intermediate.

Increase variance in the population because select those phenotype which are away from mean.

It maintain balance polymorphism and maximum selection coefficient value.

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Balance natural selection

Balancing selection is a type of natural selection that maintains genetic diversity in a population.

In balancing selection, two or more alleles are kept in balance, and therefore are  maintained in a population over the course of many generations.

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Evolution by natural selection occurs if variation must lead by Ecotypes. 

Ecophene is not be selected by natural selection