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.
Chernobyl: 25 Years After The Nuclear Disaster (PHOTOS) This year marks the 25th Anniversary of the Chernobyl nuclear disaster. At 1:23am on April 26th, 1986, operators in the control room of Reactor #4 botched a routine safety test, resulting in an explosion, and a fire that burned for 10 days. The radioactive fallout spread over tens of thousands of square miles, driving more than a quarter of a million people permanently from their homes.