A novel fungicide is introduced and widely applied to cereal crops. After five years, resistant genotypes of the fungal pathogen are detected at a frequency of about 1%; resistance is widely distributed across the pathogen’s range. Within two years, these have become so common that the fungicide becomes worthless.
Explain how this pattern can be explained by the basic features of natural selection. Include in your answer:
Mechanisms of Evolutionary Change
This unit we are learning that there are several mechanisms that lead to evolutionary change within a population or species: mutation, migration, genetic drift, non-random breeding and natural selection.
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