General > Biology
Policeing Mutations/ error repear
AZPaul:
--- Quote ---RNA is nothing in the lifeforms we know today, it was the DNA in begining (they think). but cause the dna is more stable than RNA it become the storage of information. now RNA is used to put aminoacids toghater and transmit information from the DNA, its mRNA, and what are the other ones?
--- End quote ---
I'd have to research for specifics but as I remember there are a large number of RNA types with the three most important being mRNA, rRNA & tRNA.
mRNA is the messenger carrying the codon codes (the three letter genetic code that corresponds to a specific amino acid to be used to build a protein) from DNA. rRNA is the ribosomal RNA which, together with lots of other proteins, is the actual work site for building the protein from the mRNA. tRNA is the transport mechanism to carry the appropriate amino acid for the protein being made onto the ribosome.
I am always amazed at the structure of tRNA. It is an elegant molecule shaped like a "V" (with different angles and twists for each type of tRNA) with an anti-codon on one arm and an amino acid on the other. When the anti-codon finds its codon match on the mRNA the shape of the tRNA puts the other end in exactly the right position for the ribosome to grab the amino and hang it on the building protein. Each codon on the mRNA has its own corresponding type of anti-codon match triplet on one end and exactly the right amino sitting on the other end of the tRNA molecule.
I can almost understand why Creationists insist some purposful itellegent design is at work here. The tRNA is indeed a most elegant work of chemical engineering.
Ulciscor:
Hey everyone! I'm new to the boards and to DB in general lol but this post is really interesting so I thought I'd poke my nose in lol.
Like [shvarz] said isn't the only method of correction in DNA the redundancy of code? Like lots of different groups of letters encode the same protein? But things can go seriously crazy with shifting point mutations where a letter is deleted and all the groups change? I read somewhere that's how the diversity of blood groups came about. But DB doesn't just delete letters it deleted entire lines doesn't it? And even if it did delete letters it would make no sense 99% of the time.
Lol I haven't actually said anything of any help but just thought it'd be something interesting to say.
B) Ulciscor B)
shvarz:
welcome to DBs, Ulc!
You are absolutely correct, if the mutation algorithm worked by deleting and/or inserting single letters, then the chances of getting any meaningful mutation would be very low. It's not to say that the program would not work, it's just that simulations would take very long time. So we just assume that any mutation that results in a defunct programming code is lethal and we don't even bother to create a bot with it. Well, actually we don't bother even to create a mutation like that. It is really just a shortcut, but it works very well!
Ulciscor:
What if there was a really big population with a small genome? Wouldn't it be easier to get lots of mutations there, some of which are bound to be useful?
Also what is the point of a mutation deleting parts of a gene? Should altering or copying be the only two operations, as I would have thought this would be less likely to mess the bot up.
B) Ulciscor B)
Numsgil:
That's more or less how I feel. I've had alot more success with insertions and slight changes than with deletions.
But the beauty is you can decide the liklihood of any mutations, so you're free to experiment in a deletion free universe, or a deletion only univierse.
Mutating single letters is at least technically possible. DB DNA is stored as an array of three bytes per unit, so all you have to do is shift a bunch of bytes down the strand. But as shvarz said, there isn't alot of useful mutations that arise this way.
Still, if there's a demand, I can probably work soemthing out.
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