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Politics : Evolution -- Ignore unavailable to you. Want to Upgrade?

To: Jacques Chitte who wrote (9783)	11/12/2010 4:10:42 PM
From: Brumar89	1 Recommendation Read Replies (1) \| Respond to of 69300

As soon as one working genetic code was in place, any others would be suppressed from emerging, even if they are chemically possible. The first successful code would allow organisms to reproduce ... and to eat. Uh, that sounds like nonsense. Or why do we have more than one variety of bacteria, fungi? I note that scenario requires a genetic code for an organism to reproduce. How do you develop a genetic code now? Regarding the evolution of genetic core chemistry - most biochemists currrently hypothesize that the earliest lifeforms used RNA for everything - process as well as storage. Modern cells use the much more robust DNA for storage of genomic information. The same cells use RNA as the processors - the molecules which, together with the right proteins, constitute the machinery for transcription, translation and repair of the genetic "tape". Well, thats a hypothesis that has the benefit of being simpler than lifeforms with DNA. And its easier to hypothesize simpler things than more complex things. I don't know how that changes the prospect of genetic code evolution though.