ranunky
Bluelighter
- Joined
- Jun 9, 2007
- Messages
- 1,281
Same way a moth will change color to match its background over time to avoid a specific predator. Than its predator dies off, and it takes about another 10 thousand years for it to revert/change color.
50 years.
"In 1924, J.B.S. Haldane calculated, using a simple general selection model, the selective advantage necessary for the recorded evolution of peppered moths, based on the assumption that in 1848 the frequency of dark-coloured moths was 2%, and by 1895 it was 95%."
http://en.wikipedia.org/wiki/Peppered_moth_evolution
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