Saturday, November 11, 2006
Experimental evidence of evolution
For those who say that the theory of evolution is a belief just like intelligent design is a belief, here is another piece of evidence for you. The two species shown to the left are involved in a "red queen" antagonistic co-evolution race. The wasp feeds on the larvae of the house fly, and because wasps that eat more larvae are more likely to survive and have offspring, the population as a whole become more and more efficient predators. The fly on the other hand must develop defenses against these wasps. Those larvae that are unable to defend themselves against the predator will die and therefore cannot contribute any genes to the next generation. In sum while the wasps become more and more efficient killers, the flies get better at protecting themselves, thus the relative frequencies remain stable.
What happens though if you, for each new generation, take out, say all the surviving flies, that is, all the flies that were able to survive the attacks from the wasps, and instead introduce a new population of flies that have never encountered these wasps before? What happens is that virtually all flies are killed! The wasps have evolved by natural selection, but the flies have not. If you do the opposite and introduce naive wasps to flies that have had a chance to evolve, then the relative frequencies tilt to the advantage of the fly. The wasps starve to death because they cannot overcome the defenses that the house fly has evolved.
This experiment has actually been done, way back in 1963 by Plmentel and Al-Hafldh, and yet, there are still tons of people who claim that the theory of evolution asserts that all species were formed accidentally (not to mention all the Christians who firmly believes this is what the theory of evolution says). How is the process illuminated in these experiments chance? Please, someone explain that to me, I do not understand