Methinks this calls for a non-Patrick placemarker:
Posted on 05/08/2003 10:11:06 AM PDT by Nebullis
Arlington, Va.—If the evolution of complex organisms were a road trip, then the simple country drives are what get you there. And sometimes even potholes along the way are important.
An interdisciplinary team of scientists at Michigan State University and the California Institute of Technology, with the help of powerful computers, has used a kind of artificial life, or ALife, to create a road map detailing the evolution of complex organisms, an old problem in biology.
In an article in the May 8 issue of the international journal Nature, Richard Lenski, Charles Ofria, Robert Pennock, and Christoph Adami report that the path to complex organisms is paved with a long series of simple functions, each unremarkable if viewed in isolation. "This project addresses a fundamental criticism of the theory of evolution, how complex functions arise from mutation and natural selection," said Sam Scheiner, program director in the division of environmental biology at the National Science Foundation (NSF), which funded the research through its Biocomplexity in the Environment initiative. "These simulations will help direct research on living systems and will provide understanding of the origins of biocomplexity."
Some mutations that cause damage in the short term ultimately become a positive force in the genetic pedigree of a complex organism. "The little things, they definitely count," said Lenski of Michigan State, the paper's lead author. "Our work allowed us to see how the most complex functions are built up from simpler and simpler functions. We also saw that some mutations looked like bad events when they happened, but turned out to be really important for the evolution of the population over a long period of time."
In the key phrase, "a long period of time," lies the magic of ALife. Lenski teamed up with Adami, a scientist at Caltech's Jet Propulsion Laboratory and Ofria, a Michigan State computer scientist, to further explore ALife.
Pennock, a Michigan State philosopher, joined the team to study an artificial world inside a computer, a world in which computer programs take the place of living organisms. These computer programs go forth and multiply, they mutate and they adapt by natural selection.
The program, called Avida, is an artificial petri dish in which organisms not only reproduce, but also perform mathematical calculations to obtain rewards. Their reward is more computer time that they can use for making copies of themselves. Avida randomly adds mutations to the copies, thus spurring natural selection and evolution. The research team watched how these "bugs" adapted and evolved in different environments inside their artificial world.
Avida is the biologist's race car - a really souped up one. To watch the evolution of most living organisms would require thousands of years – without blinking. The digital bugs evolve at lightening speed, and they leave tracks for scientists to study.
"The cool thing is that we can trace the line of descent," Lenski said. "Out of a big population of organisms you can work back to see the pivotal mutations that really mattered during the evolutionary history of the population. The human mind can't sort through so much data, but we developed a tool to find these pivotal events."
There are no missing links with this technology.
Evolutionary theory sometimes struggles to explain the most complex features of organisms. Lenski uses the human eye as an example. It's obviously used for seeing, and it has all sorts of parts - like a lens that can be focused at different distances - that make it well suited for that use. But how did something so complicated as the eye come to be?
Since Charles Darwin, biologists have concluded that such features must have arisen through lots of intermediates and, moreover, that these intermediate structures may once have served different functions from what we see today. The crystalline proteins that make up the lens of the eye, for example, are related to those that serve enzymatic functions unrelated to vision. So, the theory goes, evolution borrowed an existing protein and used it for a new function.
"Over time," Lenski said, "an old structure could be tweaked here and there to improve it for its new function, and that's a lot easier than inventing something entirely new."
That's where ALife sheds light.
"Darwinian evolution is a process that doesn't specify exactly how the evolving information is coded," says Adami, who leads the Digital Life Laboratory at Caltech. "It affects DNA and computer code in much the same way, which allows us to study evolution in this electronic medium."
Many computer scientists and engineers are now using processes based on principles of genetics and evolution to solve complex problems, design working robots, and more. Ofria says that "we can then apply these concepts when trying to decide how best to solve computational problems."
"Evolutionary design," says Pennock, "can often solve problems better than we can using our own intelligence."
I'll take that as an "I don't know". Well, I don't know either but it's orbit was certainly not very circular.
Well, if he was answering me he should have directed it to me. No wonder I missed his cowardly response (it seems he is not man enough to ever respond directly to questions).Once more, I am an innocent victim of the thread-destroying blue stalker.Well let's see Patrick's tremendous contributions to this thread: Post# 1045 a link to Transitional Vertebrate Fossils FAQ - not a discussion but a link-o-lies from TalkOrigins. Pure garbage which he is ashamed to post anything from in here. Posts# 1120, 1123, and 1137 are all about the advantage or disadvantage of being green, in which he contradicts himself 2-3 times.
[Not mentioned is the fact that such posts contained no insults.] More important though, it has been more than 700 posts in this thread since he said anything which was not a placemarker or an insult. [Original claim was that ALL posts contained insults!!] As I have said, he is not here to discuss anything. He is here to insult.
1,957 posted on 05/26/2003 6:03 PM EDT by gore3000
No, once more you post to All, and typically are trolling for a response that will get the thread pulled.
By the way, ignore means ignore, not snipe from the "shadows".
Methinks this calls for a non-Patrick placemarker:
I will consider that an insult and an admission that my statement is correct - that your statement that all my posts have been refuted numerous times was a lie. So, thanks for the insults, they prove me correct.
PatrickHenry:
Once more, I am an innocent victim of the thread-destroying blue stalker.Unprovoked attack:
No, once more you post to All, and typically are trolling for a response that will get the thread pulled. By the way, ignore means ignore, not snipe from the "shadows".
1,963 posted on 05/26/2003 7:32 PM EDT by AndrewC
You also don't know what All means.
Junior - holds all the answers and backs his statements up with the Pope!
PLACEMARKER!
Yup, you never post to anyone that you know you cannot refute so you just snipe and gossip behind their back with your sycophants.
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