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Evolution: Fossils, Genes, and Mousetraps (6-9)

September 27, 2006 lecture by Kenneth R. Miller, Ph.D. at HHMI headquarters for an audience of high school students from Loudon County, VA www.hhmi.org .  
 
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AthynKronos (1 year ago) Show Hide
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It probably wouldn't cruelfate, which is why it would evolve into the more complex 5-piece mousetrap over time. That is the point of evolution, simple organisms become more complex over time and adapt and become better at "their job" just like the 5-piece mousetrap would be better than the 2 or 3-piece mousetrap at its "job".
cruelfate45 (1 year ago) Show Hide
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Bacteria are still bacteria. The only true evolution that has occured in bacteria, at least that I know of, has occured due to various forms of what James Shapiro has dubbed "natural genetic engineering". But it is more precise to say this ADAPTATION is what allows the bacteria to do their job better, while you have it the other way around. The reason Behe chose the mousetrap analogy is because a 2 or 3 piece mousetrap has no job. It's not a mousetrap. We aren't in complete disagreement...
cruelfate45 (1 year ago) Show Hide
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...because if Miller can show us that the genetic coding sequence for the flagellum and the type III sec favors evolution of the more complex from the more primative, I would be listening. He of all people should know that analagous proteins means nothing, analagous structures mean nothing, WITHOUT and understanding of how each one is coded and what the genes say about their evolutionary relationship. He is completely silent on this, so I feel it's a straw man argument against Behe.
tparker37 (1 year ago) Show Hide
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the point is that the so-called "irriducibly complex" system can be selected for starting with the smaler components being selected for different functions. The signal transduction, secretory apparatus, ion transport, and axial protein components were each being selected individually. When in one bacterium the presence of all of them produced a flagellum, it was then highly selected for, and the system was complete.
cruelfate45 (1 year ago) Show Hide
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that's the theory, but how did it happen and is their genetic evidence to support this? how are the genes expressed as the bacteria copies itself? I know what you are gonna say, the flagellum was accidentally assembled in a few bacteria and they survived better, so they reproduced and passed this function on to all bacteria...ok, genetically speaking, how was a flagellum chance assembled from these other parts already chosen for by natural selection such as the parts you mentioned?
Aldelirium (1 year ago) Show Hide
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"I know what you are gonna say,"

a psychic! kill him!
VoteNixon2008 (1 year ago) Show Hide
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Miller already answered this! But this video is a few years old and the fugu fish genome was only released about 3 months ago.

Here's what I think is most likely
Scenario:
One of the mant DNA segments for the type3/1 secretory system mutated or was transposed next to a segment for something else (this could be a frameshift segment too)
The RNA copied this and brought the modified coding segment to a ribosome or polyribosomes(e-coli).
From here the old pump was synthesized with a modification.
VoteNixon2008 (1 year ago) Show Hide
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Or another possibility is that one of the histones in this segment moved so that a gene for other proteins emerged AFTER type 3 system was expressed.

Another possibilty is that an endogenous virus placed some of it's dna after the pump segment so that part of a virus(minus the dna/rna) was synthesized and the proteins folded in such a way that the viral parts natural form inside of the pump channel.

I'm running out of room here.
But there are many genetic mechanisms to account for this
GOPpersona (1 year ago) Show Hide
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I would have to agree, he's basically saying you could make a 1 piece flagellum.
AtheistDiscGolfer (1 year ago) Show Hide
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poor ignorant Behe didnt stand a chance. his ID fairytail got dominated by reality!

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