Question

How does a universal genetic code relate to the hypotheses about the origin of life on Earth?

Answer 1

all organisms on Earth have one genetic code (except
mitochondrias that probably changed it for some reasons). In fact,
universal genetic code is fundamental evidence that all organisms
(viruses, bacterias, eucariotes) evolved from one common ancestor,
because otherwise organisms should have different genetic codes.
Furthermore, according to hypothesis of RNA world, all modern organisms
came from one ancestor that was composed only from nucleic acids. This
ancestor had RNA as a carrier of genetic information, and used same
genetic code as now-living organisms

http://www.assignmentexpert.com/free-questions/question-on-biology-other-4325.html

Answer 2

Agreed with two small reservations
- some bacteria (I think the Mycoplasmas) use a slightly different code
- the origin of viruses is obscure, but it's probably not useful to describe them as descended from LUCA
http://en.wikipedia.org/wiki/Last_universal_ancestor

Answer 3

thanks:P