'Micro' evolution vs 'macro' evolution

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Maybe someone who is an expert in this field could comment on our statements.

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I'm sure no expert, but
Page not found » College of Veterinary Medicine » University of Florida
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Lentivirus isolates from different animals may differ in nucleotide sequence by 15-20%, and these differences are located primarily in the env gene. No two independent isolates of a lentivirus appear to be identical and even one isolate from one infected animal contains a mixture of genotypically distinct variants. This is thought to be due to the high rate of genomic mutations during viral replication (~1 error per 2000 nucleotides copied).

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15% is a pretty seriously large variation in sequence. I'm still looking for the actual SIV/HIV numbers.

Here are actual sequences:
Page not found - Black Hawk CollegeYou have to go a "region" at a time, and this is only one part of the viral genome, but they look significantly different for HIV and SIV, or, for that matter, for HIV-1 and HIV-2.

Chances are, this topic has wandered all over the place, but still, I'll give it a bump.Quoting all of message 1:

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Firstly, a couple of definitions, for the purposes of this thread:

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- 'micro' evolution is evolution which occurs within a species/kind; it might operate to make lions faster, over succeeding generations, or give leopards moer spots; it can never produce a leopard that is not a leopard.

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- 'macro' evolution is evolution which changes species/kinds, creating new ones, which are incapable of breeding with their parent species/kind.

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Now, if you are a creationist who (like most, it seems) accepts that 'micro' evolution is not only possible, but observed, but that 'macro' evolution is not possible, could you please explain why? What is there in 'macro' evolution that is impossible, given that 'micro' evolution is possible? Why cannot a large number of 'micro' evolutionary changes result in a 'macro' evolutionary change?

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Oh, and if you're going to cite some sort of inter-species boundary which evolution cannot cross, please cite some sort of evidence for such a thing. "We've never seen it happen" is not evidence that it cannot, or does not, happen.

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I also suggest going back and reading at least the earliest part of this topic string.Adminnemooseus