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Shore nuff? Are viruses living organisms? "
Well, that is debatable. For our purposes, however, they have muatable DNA and show the ability to adapt. These are the types of processes we are looking for whe nwe want to discuss the importance of evolution to medicine, as an example.
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How do we know this is evolution and is not an inherent ability that is not previously expressed?"
The various strains of the flu virus are adapting by a combination of mechanisms. Two are quite important. One is the mutation of the genes that are part of the flu virus. The flu is a very simple organism. It only has 8 gene segments. Changes to the genes can influence how the virus behaves. One protein that the flu makes id hemagglutinin. This is a protein on the surface. Changes here can affect what kinds of hosts the virus can infect. Another protein is neuraminidase which affects how well the virus can spread new copies. Changes to the genes, and especially the ones that make these proteins, can alter the virus in new ways. These are caused by mutation which is a very important part of evolution.
Another way that the virus can adapt is if the same host gets infected with two different strains. Then new combinations of the eight gene segments can combine in novel ways. Sort of like sex for a virus. But this can create novel combinations of traits which may make a new strain of the flu which could potentially be deadly.
These two together are the reason for concern about a possible bird flu epidemic in SE Asia.
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According to evolution, are viruses the evolutionary precursors of living cells or are they debris from once living systems?"
Red herring. Why does it matter? A virus does not exactly lend itself very well to a fossil record. But you can apply genetic techniques to viruses and learn about their phylogeny. These techniques support origins for various families of viruses hundreds of millions of years ago. These techniques also suggest multiple paths for the origin of viruses based on the type of virus.
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Is this evolution or variation within the existing genetic parameters?"
Well, they are making new sequences of their genes so I don't see how it could be considered anything other than evolution.
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If viruses are evolving at such a rate, then explain why we don’t see macroevolutionary change posited as having occurred in other organisms? In other words, viruses are still viruses despite all the supposed evolution that we should have been able to observe over the past couple of decades. At this rate of change, we ought see some new intermediate life form. However, viruses are still viruses including the new emergent forms. "
Just what do you want to see a virus turn into?
This is a common mistake that YEers make. I am surprised that you would make such a mistake. They assume that evolution should by necessity lead to what we consider higher and more complex organisms. In reality, they are exploiting a niche and have little likelyhood to evolve into something we would consider more grand.
Take the example of bacteria. There is more genetic diversity within these single celled organisms than in all of the multi-celled organisms on earth. They have been very successful as single celled organisms without any need to become multicelled. Only a tiny fraction of the life on earth has come to exploit niches for multi-celled life.
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Well, if this is your level of scientific citation, then you are rather light in your understanding and evidence. At best, your source is high school biology and at worst, it is tabloid science for public consumption. Sorry but I don’t feed at that trough."
I think if you take a look around at some of the threads where I take on the facts, you will see that my primary sources are the original primary literature. See a few of these.
http://www.baptistboard.com/ubb/ultimatebb.php/topic/66/104.html
http://www.baptistboard.com/ubb/ultimatebb.php/topic/66/19.html
http://www.baptistboard.com/ubb/ultimatebb.php/topic/66/23.html
http://www.baptistboard.com/ubb/ultimatebb.php/topic/66/21.html
http://www.baptistboard.com/ubb/ultimatebb.php/topic/66/18.html
The flu link was not mine originally. I just pointed out what you seem to have missed.
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Are you, an engineer, qualified to evaluate?"
Nope. I am forced to trust the experts.
Changing gears...
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Well, they were talking about good ole Ernest Haeckel, if you know who he was, and giving him the credit for this wonderful concept. Although I do not claim to be an expert embryologist, I do know a fair amount about the subject. When a textbook is claiming that embryonic aortic development was once gill slits, then I know it’s hogwash. This is the kind of science that firmly established the acceptance of evolutionary thinking in the public mind."
If they were presenting Haeckel's orignal ideas as fact that they should certainly called out for such an egregious authorship.
But it is possible that they were using Haeckel to introduce good science. All vertebrate embryos have a series of structures called by various names including pharyngeal arches and even "gill slits." In different vertebrates, different arches form different structures. Showing this is good science. For instance you can show that the same embryonic structures form the jaw in reptiles and the inner ear bones in mammals. The fossil record then shows that the reptile jaw evolved int othe mammal inner ear bones. So in this way, ontogeny supports the fossil record.