What can be expressed the evolutionary role of mutations?

The mutation process is the source of the reserve of hereditary variability of populations. By maintaining a high degree of genetic diversity in populations, it provides the basis for natural selection.
By the nature of the effect on the body, mutations are divided into lethal, semi-lethal, neutral and useful. Lethal mutations are incompatible with life, and their owners die. Semi-lethal mutations lead to a sharp deterioration of any vital processes. Useful mutations underlie the evolutionary process, leading to the appearance of traits useful for the species. These characteristics, fixed by natural selection, can further lead to the formation of a new systematic unit – a subspecies or even a species.

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