"Natural selection does occur within the respective animal kinds, but only because of genetic loss ("speciation"), not because of genetic enhancement (Darwinian evolution)."
- IAC
Below is a scientist making IAC's claim look like something a third grader ripped out of thin air.
I might be, but this guy makes you look pretty "simple":
"However, evolution does not work like that. What happens is that mutations transfer entire domains and stretches of sequence around; or random insertions form completely novel domains and folds. These changes can have 1) a negative effect (somewhat likely), in which case they are selected against; 2) neutral effect (most likely), in which case they will remain in the genome to be acted upon further; 3) positive effect (unlikely in the first iteration), in which case they are selected for.
The most frequent case, therefore, will be: protein has changed, there are all these disordered loops or extra helices, barrels, sheets, whatever - but it still works. Activity may be affected, but not sufficiently to make a large difference.
What happens then? Small mutations will affect these new domains and alter their specificities. Again, there is a reason why so much of the biochemistry follows similar paths and similar reactions. The protein folds are similar. Evolution relies on taking something that already exists, and altering it slightly, to produce a novel effect. The cumulative effect over a long period of time can be staggering - as directed evolution experiments have shown, and as observed evolution in the last century has shown."
http://www.talkorigins.org/origins/postmonth/feb05.html#run
This is an actual scientist which knows more about DNA then you will ever dream of.
- IAC
Below is a scientist making IAC's claim look like something a third grader ripped out of thin air.
You're obviously in a bit over your head there NDS, hang in there buddy.
I might be, but this guy makes you look pretty "simple":
"However, evolution does not work like that. What happens is that mutations transfer entire domains and stretches of sequence around; or random insertions form completely novel domains and folds. These changes can have 1) a negative effect (somewhat likely), in which case they are selected against; 2) neutral effect (most likely), in which case they will remain in the genome to be acted upon further; 3) positive effect (unlikely in the first iteration), in which case they are selected for.
The most frequent case, therefore, will be: protein has changed, there are all these disordered loops or extra helices, barrels, sheets, whatever - but it still works. Activity may be affected, but not sufficiently to make a large difference.
What happens then? Small mutations will affect these new domains and alter their specificities. Again, there is a reason why so much of the biochemistry follows similar paths and similar reactions. The protein folds are similar. Evolution relies on taking something that already exists, and altering it slightly, to produce a novel effect. The cumulative effect over a long period of time can be staggering - as directed evolution experiments have shown, and as observed evolution in the last century has shown."
http://www.talkorigins.org/origins/postmonth/feb05.html#run
This is an actual scientist which knows more about DNA then you will ever dream of.