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Author Topic:   Evolution Requires Reduction in Genetic Diversity
Dr Jack
Posts: 3514
From: Immigrant in the land of Deutsch
Joined: 07-14-2003

Message 483 of 1034 (758026)
05-18-2015 6:20 PM
Reply to: Message 481 by herebedragons
05-18-2015 3:31 PM

Re: Moderator Introduced Definitions
"Junk DNA" was a very unfortunate term coined in the early days of genetic sequencing when it was thought that DNA --> Protein was the major player. It is now known that it is not anywhere near that simplistic. We now suspect that the majority of "non-coding" sequences actually have a function. Even spacer DNA that is 1000's of bases long serves an important function even though they don't "do" anything other than keep two segments seperated. The term "junk DNA" really needs to completely fall out of usage.
This is an extremely minority view among actual working Geneticists. It essentially springs from the extreme overreach in the selling of the ENCODE project in which they absurdly equated 'transcribed' with 'has a function'. In fact, we know that a large chunk of DNA is junk because we know exactly what it is, and the majority of the rest is almost certainly junk. There are bits and pieces of signal among the noise but the majority of it has no function at all. The differential rates of mutation between Junk DNA and coding DNA across evolutionary time should be sufficient to convince you of that.

This message is a reply to:
 Message 481 by herebedragons, posted 05-18-2015 3:31 PM herebedragons has not replied

Replies to this message:
 Message 485 by Faith, posted 05-18-2015 7:51 PM Dr Jack has seen this message but not replied
 Message 505 by Denisova, posted 05-19-2015 6:41 AM Dr Jack has not replied

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