Quote:
Originally posted by sacX
"Some breeds have been developed to emphasize certain physical traits beyond the point at which they can safely bear litters on their own. For example, the Bulldog often requires artificial insemination and almost always requires cesarian section for giving birth."
Wikipedia
Do a search for it, there's plenty of information arouund.
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sac, I think I alluded to this in one of my posts. Quite frankly I didn't find a whole lot except for conjecture and uncertain evidence.
For example "There is archaeological evidence of dog remains, showing the characteristic morphological differences from wolves, from at least 14,000 years ago, while wolf remains have been found in association with hominid remains that are at least 400,000 years old. "
"Some evidence suggests that several varieties of ancient wolves contributed to the domestic dog". Evidence on a topic like this is far from certain.
But without attacking the evidence, let us look at the qoute you provided about the bulldog. The qoute says that Bulldogs have developed extreme traits and that they often require artificial insemination and cesarian section. Now, do you think this is an example of evolution or de-evolution? Do you think a dog would evolve in such a way that it makes it more difficult to breed to the point where if it existed without man, it would be extinct within one generation or two? To me, this is the opposite of evolution. It suggests a problem that we've introduced by interbreeding dogs for traits so far from their own that they're unnatural and wouldn't survive. Evolution is adapting, not un-adapting to the environment.