(May 22, 2017 at 10:11 pm)ignoramus Wrote: I'm still fascinated by the notion that life can only evolve by only one possible genetic framework.
IE, do you guys believe that other life on other planets could have a completely incompatible tree of life to ours?
If so, if panspermia happened concurrently with our own independent evolution, why then, is there only one tree of life?
Did our conditions favour only one? Shouldn't it be the home grown advantage, logically speaking?
I guess I'm not sure what is meant by 'incompatible'.
It turns out, for instance, silicon based life is vastly less probable than carbon based. The chemistry of the element silicon just isn't complex enough.
I'm not sure that anyone has definitively worked out that a double helix of DNA is favored over some other geometry, btw. I recall 'Moties' (fictional) were noted to have genetic information conveyed via an arrangement of disks and rods. Obviously, life forms with a totally different 'geometry' of their heritable elements will be certainly incompatible with our double helix arrangement, even if some of the chemicals were the same.
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