Uh, so, it's a tad technical, so bear with me.
It turns out that some of our "junk" DNA, which mutates very rapidly, is bound together by specific proteins.
And these proteins differ between species and this, not different chromosomes, may be the key that prevents species from interbreeding.
Which implies that canines, which interbreed happily, all have the same strategy for holding together their junk DNA.
It also means that a bit of genetic engineering could fix the hybridization problem...
...which means that in the future we might be able to make fertile, true-breeding...
...mules...
I love mules, but that scares me.
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