The scientific interest of Shevchenko was focused on the problem of genetic consequences of ionizing radiation on animals, plants, and humans on radioactively polluted territories. For 40 years since 1962, he has organized annual scientific expeditions to the area of the East Urals radioactive fallout. These expeditions yielded unique evidence on the dynamics of mutational process in natural populations of microorganisms, plants, and animals. In their framework, a phenomenon of population radioadaptation was discovered and microevolutionary processes operating in irradiated populations over generations were examined.
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