Describe how insects adapt to pesticides

A mutation occurs in a pest population.
If this mutation is positive, that is, useful, and ensures the resistance of an individual to a new pesticide, then this mutation is fixed by natural selection, that is, individuals resistant to environmental conditions mainly survive, and individuals who do not have a mutant gene die.
As a result, this mutation spreads throughout the entire population (insects reproduce very quickly), and almost every individual has a mutant gene that ensures its resistance to toxic chemicals.
Thus, under the influence of natural selection, a population is formed that is resistant to this toxic chemical.

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