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Author Topic:   How do "novel" features evolve?
Meddle
Member (Idle past 1270 days)
Posts: 179
From: Scotland
Joined: 05-08-2006


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Message 201 of 314 (660183)
04-21-2012 5:03 PM
Reply to: Message 161 by foreveryoung
04-21-2012 12:06 PM


Re: slightly off topic ... but we can redirect
My arguments are either valid or invalid. Please either refute my premises or refute my argument. Are you going to do that or are you going to ask me for evidence again?
Okay, you initially stated that there is no way for keratin change into collagen but gave no explanation why. After all these are both protein molecules defined by their sequence of amino acids, so it does not seem unreasonable that a series of mutations over time could change one to another.
In a later post you then elaborate that the reason being that during the change to collagen the original function as keratin would be destroyed. However as others have pointed out this argument would fail if the mutations resulted in collagen affected a duplicate of the keratin gene. It is well documented that genes can be become duplicated and one one of them subsequently become altered by mutations while the other retains it's original function. Look at pseudogenes such as steroid 21-hydroxylase gene, which humans have two of, one being disabled by an eight base-pair deletion (the same as found in chimpanzee's).
Also if you looked into collagen or keratin you would know that they are not examples of single genes but each actually comprise of a group of proteins. Any one of these could have had mutations and then diversified through further duplication to form another protein or group of proteins. Of course having said all this I'm not saying that keratin actually change into collagen.
I realise you are getting tired of people asking for evidence, but I would say when you first posted in this topic it came across as an off-hand post. But if you had taken your time and developed your argument, even including what you put into your second post in the thread, we would have a better understanding on where you were coming from and could have a more useful discussion. As you say you don't want to spend 2 hours writing a post, but then we may need to spend that time or more to do the same to give a satisfactory response.
As for being off topic, as said above the change from one protein to another is fairly simple and likely to have happened in a unicellular or simple multicellular organisms. If we were discussing such changes in bacteria you ould have probably dismissed it as microevolution.

This message is a reply to:
 Message 161 by foreveryoung, posted 04-21-2012 12:06 PM foreveryoung has not replied

  
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