The Cadet
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- Apr 29, 2010
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@Justatruthseeker I feel like I'm repeating myself here, but using dog breeds as the model example is just not reasonable. Oh wait, I am repeating myself.
Starting to move away from misleading and towards dishonest at this point. Look at any other species and you do not see anything resembling this kind of diversity. There's simply nothing else like it in nature without human intervention. It is not a reasonable basis for any kind of model. Find me one other currently extant species or breeding population with the same level of morphological diversity that dogs offer that wasn't explicitly bred for those qualities by humans. I don't think there is one.
Let's make something clear here. Comparing dog breeds to anything found in nature is simply not a good example.
Ironically, even Answers In Genesis has you beat when it comes to understanding the science behind dog breeding (although their conclusions are asinine). See, what happened with the various breeds of dog is that we isolated mutations within populations of dogs, and explicitly bred for those mutations. Two differences here compared to what we see in nature:
And of course, throughout this, most of the genetic material was unchanged. Breeds of dogs were changed by humans. They do not mirror almost anything in nature, let alone most of the fossil record, and using them as an example is misleading at best and dishonest at worst.
- Selection pressure. Most of these mutations are the kind that would be quickly bred out of the population. As AiG rightly points out, the mutation involved in Pugs, Pekingese, Bulldogs, and the like all lead to a significant drop in fitness. If these dogs were out in the wild, these sorts of mutations would have been a death sentence, and they almost certainly would not have found a mate, let alone dozens...
- Number of breeding partners. (I'm going off what a friend who breeds dogs told me quite a while back here; I could be somewhat off base, and if I am, someone please correct me.) In an attempt to further the lineage of that mutation, these dogs will be explicitly bred with as many partners as possible, then incestuously with any further members of the lineage that share similar traits. In nature, this does not happen. As previously stated, many of these mutations are explicitly harmful for the organism. In the wild, a dog with dwarfism would almost certainly not survive. A dog with short, stumpy legs, a dog who couldn't breathe well, a dog who couldn't hunt or eat or even chew their food well, would have trouble finding one mate, let alone many.
Starting to move away from misleading and towards dishonest at this point. Look at any other species and you do not see anything resembling this kind of diversity. There's simply nothing else like it in nature without human intervention. It is not a reasonable basis for any kind of model. Find me one other currently extant species or breeding population with the same level of morphological diversity that dogs offer that wasn't explicitly bred for those qualities by humans. I don't think there is one.
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