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Old July 29 2013, 09:21 AM   #15
Re: New 4th Domain of Life discovered?

Llama wrote: View Post
Tiberius wrote: View Post
Llama wrote: View Post

It could be - there is still so much we don't know.
It would be interesting to see what they get from sequencing the genome of these new things.

I think it's unlikely that life only started once and that everything evolved from that first single cell (seems to Adam and Eve to me). I'm sure life occurred several times, some lineages died out, some combined (like ancient archea and bacteria fusing to become eukaryotes, or modern bacteria swapping plasmids).
If that's the case, we should see that the genetic code of the organelles is significantly different to the code of the nucleus. My understanding is that this isn't the case.
To the best of my knowledge mitochondrial and chloroplast DNA is bacterial in origin and nuclear DNA is Archean in origin. I can't remember if I read that in an article or saw it in a doco so I can't verify that claim
Yes, but the bacteria and the archea both came from a common ancestor. They aren't the results of two completely independent rises of life.
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