What is the evolutionary significance of a near-universal genetic code? - evolutionary significance of a near-universal genetic code
They believe that the DNA / RNA?
It just means that life appeared only once on Earth and was the basis of DNA into RNA. Only reinforces the fact that we are all related, had a common ancestor. Some "life", such as prions, the cause of the disease BSE, have no DNA / RNA, but still managed to reproduce so that the quasi-universality of the genetic code.
Saturday, January 16, 2010
Evolutionary Significance Of A Near-universal Genetic Code What Is The Evolutionary Significance Of A Near-universal Genetic Code?
3 comments:
Common ancestor before the evolutionary divergence.
Suggests that all life developed on Earth separately from a common ancestor.
Since the universal genetic code (codon codes for valine at Guu * * all organisms, nothing else, for example), it follows that all developed from a parent organization that this code is used. This is because there is no code particulr reason must be universal: Even if we all use the same components (the same 5 nucleotides and the same 20 amino acids), there is no reason why he could not Guu code for valine in an organism in another cysteine and alanine in another, is the only reason that all evolved from a single organization.
If you are a creationist, this means that God has a limited imagination, or God did not want to create the various means of reproduction.
For others, it means that the biochemical available chemicals necessary for life by way of the quantity and type of chemicals in the environment and the physical limitations of the environment found limited. So with this point of view, regardless of the evolutionary history, only a limited number of chemical compounds, the properties of reproducing an organism, it is logical that the genetic code ultimately converge in a certain way that works in the most efficient as possible. This theory has merits, because we do not know the genetic code of the vast majority of life have existed on earth, is represented only by fossils.
Finally, it is logical to assume, that the genetic agencies which exist today are similar to each other, so that no accident would have similarities that can happen. Together with the fact that the sameManagers shares have similar genes, and there is a continuum of alleles shared by different species, it seems an evolutionary line.
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