Bottlenecks and Founder Effects. Genetic drift can cause big losses of genetic variation for small populations. Population bottlenecks occur when a populations size is reduced for at least one generation.ottlenecks and Founder Effects. Genetic drift can cause big losses of genetic variation for small populations. Population bottlenecks occur when a populations size is reduced for at least one generation.
Chernobyl, or Chornobyl, is the name of a city situated in northern Ukraine near the border with Belarus. Chernobyl was largely abandoned following the disaster at the Chernobyl Nuclear Power Plant located 14.5 kilometres (9 miles) away.
(redirected from Chernobyl') Also found in: Dictionary, Thesaurus, Encyclopedia, Wikipedia. The 1986 site of a nuclear reactor accident near Kiev, Ukraine, which was caused by a steam explosion. It is the worst nuclear power plant disaster in history and the only level 7 instance on the International Nuclear Event Scale. It resulted in a massive release of radioactivity following a power excursion which destroyed the reactor.