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Author Topic:   No New Genetic Information?
mobioevo
Member (Idle past 6059 days)
Posts: 34
From: Texas
Joined: 12-13-2007


Message 21 of 27 (440577)
12-13-2007 6:36 PM
Reply to: Message 1 by bernerbits
12-11-2007 2:51 PM


New genetic information is created
I don't know why someone would think new genetic information is not created. As your example of the flu virus, if you have two different types of flu infecting the same cell then a new flu virus can be created by the merging of both flu virus' genomes. This is why many virologists are nervous about H5N1 (bird flu) as H5N1 could go into a human host while they are infected with the common flu virus, and out come a new virus that is much more virulent that can easily infect humans.
Gene duplication whether it is small duplications of DNA or wide scale duplications such as the entire genome can also produce new genetic information. Once a gene is duplicated, there is redundancy in the genome and a normally deleterious mutation can then becomes a neutral mutation as there are now two copies. As these mutations increase, it is possible to eventually create a entirely new gene. Thus, new genetic information is born.
It has been a few years since I have posted on this forum. The last time was about 2 or 3 years ago when I was a college student. Now I am a graduate student studying molecular evolution. Unfortunately, my old account has been inactivated or I got the name wrong. I'm looking forward to many discussions on evolution.

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 Message 1 by bernerbits, posted 12-11-2007 2:51 PM bernerbits has not replied

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mobioevo
Member (Idle past 6059 days)
Posts: 34
From: Texas
Joined: 12-13-2007


Message 24 of 27 (440598)
12-13-2007 7:42 PM
Reply to: Message 22 by AnswersInGenitals
12-13-2007 7:01 PM


Re: Proccesses that create information.
quote:
if new information cannot be created by a process that is wholly or partly random
I don't know who said that but I didn't. I am biologist and not whatever you call someone that studies information so excuse any misunderstanding of information theory that might exist.
I also was not talking about Darwinian evolution but you could call it the modern evolutionary synthesis, but evolutionary biologists just call it evolution. Evolution is not random. Mutations are random and mutations create new information. You could have a single mutation at a locus, you could have a small duplication caused by a retrotransposition event, in which mRNA is reverted back to DNA, or you could have a whole genome duplication so that the entire genome is duplicated. In any event new genetic information is created in a random or somewhat random event (not all genes are duplicated equally).
It is the selection on the mutation that is not random. Whether the mutation is deleterious, neutral, or beneficial is entirely up to the environment in which the mutation has occurred.
Is there evidence that new information has occurred? Yes, look at the divergence of genes from prokaryotes and then look at the genes in eukaryotes. There are more genes in eukaryotes. You can also look at the number of gene families in eukaryotes, which many, if not almost all, where created by gene duplications.
Go to Google Scholar and search "gene duplications source new genes" and you will see the many papers discussing how gene duplications will create new genes and new proteins.
Edited by mobio, : typo

This message is a reply to:
 Message 22 by AnswersInGenitals, posted 12-13-2007 7:01 PM AnswersInGenitals has replied

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