They might even cite Judge Jones to prove it. However, they aren't the same thing, and this argument doesn't address ID, although it claims to.
Agreed, ID doesn't rest on the human/ape divide or on any specific point in evolutionary history. It just claims, in its many forms, that there was intelligent intervention in the process.
The obvious question an ID proponent would ask has already been asked, in a different form, in this fledgling thread. What is the probability that two chromosomes would fuse in such a way that the resulting organism had a biological advantage?
Better to ask what
disadvantage it would have. (The contribution to speciation is obvious, but that's not always advantageous.)
They would then describe how horribly unlikely the fusion was in the first place ...
The dividing nucleus is a scene of controlled chaos. Chromosomes aren't copied from end to end, they're copied in chunks which have to be marshalled and connected up, the opportunities for mistakes are legion. There's an extra step for germ-line cells. Chromosome fusion (or duplication, see Down's Syndrome as I recall) is not by any means horribly unlikely.
...and possibly say how incredibly unlikely it would be that the fused chromosomes would be functional at all ...
No genetic material has been lost. There's a buffer-zone of telomeres between the chromosomes so they shouldn't interact much. Where's the killer problem?
... and how amazingly astoundingly unlikely it would be that it would actually be passed between generations in such a way that there would be a biological advantage.
It could be passed along easily enough. During fertilisation the unfused chromosomes could align with the segments of the fused chromosome, which might prove the dominant form. That would be in the early days, of course, over time the fused version would become more conventional, less apt to the
menage. By then speciation has occurred. No specific biological advantage required, just advantages that happened to be carried by the population involved.
They would then conclude that there must have been some supernatural assistance to make it work.
That's because they're working with the wrong figures.
And while you might think that's preposterous, I'm willing to bet you can't prove it.
I can kick it about a bit, though.