Drosophila Subobscura (Photo by Malcolm Storey) |
In 2011, when a heat wave hit Western Europe, many of the flies still had their “winter genome”. But right after the temperature spiked, they switched to the “summer” variant months ahead of schedule.
The team still did not understand the genetic mechanism responsible for the effect, but study author and evolutionary biologist from the Universitat Autonoma de Barcelona notes a clue that flies carrying the “summer” inversions to deal with the heat wave produced five times more offspring than they would have in ordinary years.