Blue-Lightning said:
I don't want to get into this debate as I'm involved in the official one... but I would like to clarify that Tiger is obvliviously incorrect. Microevolution could occur for another 10 billion years and dogs would still be dogs. Macroevolution could occur once in those 10 billion years and suddenly you would have something different. What Tiger fails to understand or recognize is speciation.
BL
Unfortunately, the difference between Micro and Macro evolution is only in our minds.
It is only the human mind that insists on drawing a line and saying "Micro to this point, and Macro afterwards"
But like I said, they both use the same theory, the same mechanism. The only difference is time, nothing else.
A good anology, and it's been used before, is giving someone a penny.
It doesn't make them rich.
Give them a penny... Are they rich?
Give them a penny 100 times... Are they rich?
Give them a penny 10,000 times... Are they rich?
Give them a penny 1,000,000 times... Are they rich?
Give them a penny 100,000,000 times... Are they rich now?
At the fifth step, they have become a millionaire. That is a huge difference and they are no longer what they were in the beginning. They have become rich... They have "macro" evolved, and all through small change.
Now, swap the penny for a very small biological "micro" evolution...
It results something that has 100,000,000 differences to the original, and that is very, very unlikely to be anything similar to the original.
We have seen Microevolution, it happens and denying it is denying reality. Add all those small changes up over millions of years, and you get the organism with those millions of differences.
So what happens with these dogs? The ones with 100,000,000 differences from any other dog. Are they still dogs? Or are they so different that you have a new species? Lets face it, just a few changes gives us breeds that are barely in the same species, and that's in just a few thousand years...
Anything with that amount of difference is not even remotely similar to the "parent" organism. It has become a new species, it has undergone speciation.