When articles like this talk about interbreeding, I can't help but wonder how that happened. At the time, were we close enough to them in appearance that it would have happened willingly, or are we talking about rape scenarios?
If they looked really different, or were really different in some other way, than I could see them being ostracized. Of course, it is also possible that primitive man couldn't tell the difference between themselves and the others.
I hope for the day when a bone or whatever is found that contains something like 25-50% human and 25-50% Denisovan or Neanderthal... The frozen expanses of Siberia seem to be a good place to look for them...
Well, the DNA itself probably wouldn't be enough because it doesn't really encode an algorithm or recipe describing how a (multicellular in this context) living organism is constructed from it's genetic information. Instead, the DNA is more like a huge collection of building blocks. But how and what will be constructed from this pile (meaning what will be included in the final system and what won't) that's a completely different matter.
That said, there has been quite an exciting paper published around a year ago describing the first simulation of one life cycle of an in silico Mycoplasma genitalium (the smallest known bacteria). Here's a link to relevant HN discussion:
For simple organisms, we could probably consider what would happen if we put their DNA in the nucleas, letting it be transcribed by the 'standard' process. This is exactly what viruses do when they inject their DNA/RNA into a foreign cell so they will be cloned.