A gentle introduction to genetic algorithms

Not really. Subsequent studies show that the original experiment by Kettlewell was valid. I'm not an expert in this field but the scientific papers seem sound. http://rsbl.royalsocietypublishing.org/content/8/4/609

In any case, the peppered moth example is only an illustration of the idea of natural selection.

Peppered moths experiment is discredited: http://natureinstitute.org/pub/ic/ic8/moth.htm