Common descent is powerful precisely because it explains the differences too.
Lets start with just the common ancestry of chimpanzees and humans. Do you dispute this? What specific genetic evidence to offer to against this?
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This.
The deception employed (wittingly or unwittingly) by Cornelius and other evolution denialists is that the terabytes of sequence data we have only amount to some vague âsimilarity.â The reality is that these trees are constructed from differences.
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As for new body plans (which is a Humpty Dumpty term), since you question the ancestry of vertebrates, you might want to check out tunicates.
As for new protein complexes, do you have any examples? And are you aware of the time required to evolve (using variation random with respect to fitness and selection) a highly-specific novel binding site with nanomolar affinity?
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[quote=âBillcole, post:76, topic:5974â]
How can we explain these complex sequences appearing through neutral mutations that occur in isolated populations? The math simply does not work.[/quote]
What math? Why would you limit consideration to neutral mutations and not consider selection?
[quote]I think the evidence is pointing to multiple origins of life as an alternative hypothesis to universal common descent, or multiple origins of life in combination with common descent.
[/quote]Then letâs discuss some actual evidence, not what Cornelius says about evidence.
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I canât speak to individual people on this but I do not think this is usually deception per se. I think many of them really think this is true. Though, of course, this betrays some big misunderstandings about evolutionary theory and genetic data.
For example, on a basic level, if you can mathematically model the similarity, this is equivalent to modeling the difference. E.g. a similarity of 80% is equivalent to modeling a difference of 20%.
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@Billcole we have covered this elsewhere with others.It turns out that those new complex DNA sequences came from prior DNA sequences. All the de novo genes in humans have counterparts in apes (in non coding regions).
We are still waiting for a response about this. Perhaps you could give it a try.
And before we give it a full go, keep in mind that even if this was a good argument it is not an argument against common descent. At its best, it is an argument for a yet undiscovered mechanism of change.
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Dr. Hunter,
Hope you are doing well by Godâs grace today.
Thatâs a claim I cannot accept. The mapping of 64 codons to 20 amino acids might be a telos to Richard Dawkins, but I donât think it would be a telos to Aristotle or Aquinas. It certainly doesnât seem like a telos worthy of the God I worship.
My general observation is that biology, like basically every other branch of science, has some unsolved mysteries that are being researched. Your examples have pointed out that in something as complex as life, much variance (ânoiseâ) exists alongside or within the theory (âsignalâ). Your examples scarcely begin to address the existence of the signal, as far as I can tell.
To provide one example, Nakhleh (2013) describes the considerable progress made in the reconciliation of phylogenies, while acknowledging the challenges that remain. Your approach, as far as I can tell, is to cite the remaining challenges without acknowledging the progress that has been made. This is how I am interpreting benkirkâs response to your series of articles:
The mountain of evidence for common descent includes the fossils showing the development of fins in Cetacea, the patterns in the distribution of endogenous retroviruses and pseudogenes, etc. If you want to convince the 99% of the biologists who disagree with you, I suspect youâll have to address the strong evidence at the heart of the theory of evolution, rather than nibble around the edges and proclaim its defeat.
My $.02
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De Novo genes are indeed a fascinating area. One of the debates is the mechanisms that can make these changes. Our limited understanding of DNA makes this even more difficult. The genome is a sequence of the chemicals initialed ATCG. These four chemicals arrangement makes up the genetic code. The challenge is the amount of ways they can be arranged vs an arrangement that functions properly. Since they are a sequence the amount of ways they can be arranged is 4^3.2 billion ways(the standard formula for a sequence) in the case of the human genome. How does this massive amount of sequential chemicals become arranged to create a unique animal?
Lets start with just the common ancestry of chimpanzees and humans. Do you dispute this? What specific genetic evidence to offer to against this?
Hi Joshua
Yes, this is a fascinating transition or special creation. I would like to have this discussion without a conclusion but in order to better learn about the evidence. If you believe there is a reasonable hypothesis that humans and chimps descended from a common ancestor, can you state a clear hypothesis?
I think there are probably similar sequences to de novo genes between chimps and humans. Through the history of life there are significant jumps that need to be made that appear to require significant engineering to come up with the proper DNA codes for both the protein exon regions the splicing code regions. I think it is exceeding unlikely that current evolutionary theory can explain this. We donât have an identified mechanism that creates novel new functional sequences. This gets even messier when we talk about regulating sequences like micro RNAâs.
Hi Ben
I have looked at models like Michael Lynches and they require very large populations and time to get a few mutations fixed in a population. If you have a suggested model I would be very interested to look at it.
Well, the obvious answer is to start smaller. Nevertheless, for the purpose of your question, letâs just look at the current size of our genome. The average number of new mutations in the genome of each human is 60. The overall genetic variation between humans is several million differences. A fairly small number of these differences are being selected upon strongly, a larger proportion are subject to weak selection, and the rest (neutral variations) are just âdriftingâ with the fortunes of their carriers.
Obviously, the number of possible âunique animalsâ that can be formed using our genetic code is enormous! How do you think we should mathematically quantify this proportion? And how can we track through time the changing probabilities of viability as the complexity of our organism population grows?
Meaning that the codeâs degeneracy would not be created by a designer worth his salt? Interesting argument, but Iâm afraid if the code is biochemically determined, then teleology is inescapable. This is particularly true given that the code is so unique and ~optimal. It would be difficult to imagine a better example of design.
OTH, if it is not biochemically determined (which I think is the case), then it demolishes evolution, since you would literally have to evolve somehow through an astronomical rugged search space.
Hi Cornelius, hope you are doing fine today. I would like to respond to something you just said to @Chris_Falter.
I thought we had agreed before that the DNA code used by most branches of the evolutionary tree is not unique and that there are many alternative versions of it being employed by all kinds of micro-organisms.
Variation in the DNA code for the earliest forms of life could explain (1) why there are so many present-day variations in the genetic code among relatively simple micro-organisms and (2) why the code employed by our line of descent appears to show some degree of optimization. I donât see how these findings are problematic for the evolutionary paradigm. On the contrary, it seems to be evidence for emergence of the genetic code through evolutionary processes.
Casper
Hi Casper:
So a couple of points here. First, (Ling, 2015), which I think you cited earlier, does demonstrate many alternate versions of the DNA code, as you say. However, they are defining âDNA codeâ differently than we are. In addition to the actual code, they also are including codon bias, ambiguous decoding, and recoding. Those three things are not really part of the code, per se, so much as how the code is used. And those three things are certainly important. There are all kinds of subtleties, like those, at the molecular level, which do not fit CD. But in terms of questions about how the DNA code itself evolved, those three things would typically be considered a different question.
So, second, what about the actual different codes. They arenât all that common, and the different codes we have discovered are all minor variants of the canonical code. Again, these are interesting and important. In fact, not surprisingly, their pattern also contradicts CD. BTW, Ken Miller once argued that they, in fact, do nicely fall into a CD pattern. That is false and he reworded/elaborated on his claim, saying that convergence shows a CD pattern. 
So, third, we really donât see a CD pattern that would show different codes going back to the LUCA, or LUCAs, or a network, or whatever. From an evolutionary perspective, the conclusion has always been that the canonical code goes back to the LUCA.
If the code were not ~optimal, it would solve a lot of problems. You would still have the problem of how a code, any code, would evolve in the first place. But at least you could stop there. Any old code would do. Instead, once you have a code up and running (somehow), you then have to traverse, and search through, an astronomically large code design space, chocked full of local minima in a rugged fitness landscape. Itâs not going to happen.
The one way around this is to say the code is biochemically determined, so that (again, somehow) it basically self assembles. It doesnât evolve, so much as merely comes together. That is just a real stretch, but for those who want to go there, it would mean an incredible confirmation of design.
So there you have it. The DNA code either (i) demolishes evolution, or (ii) confirms design.
Hello Bill,
IIRC we are discussing your agreement with Corneliusâs claim, âThere is a vast amount of evidence against common descent,â and your claim, âI think the evidence is pointing to multiple origins of life as an alternative hypothesis to universal common descent, or multiple origins of life in combination with common descent.â
May we please focus on evidence, not models nor arguments, since you have explicitly specified evidence?
My question is purely evidentiary: âAnd are you aware of the time required to evolve (using variation random with respect to fitness and selection) a highly-specific novel binding site with nanomolar affinity?â
The answer is a number and unit of time. Are you aware of it?
I split some posts into other threads. Please check the new threads before you post.
This is a very interesting point. The key to getting our arms around the sequential space challenge is conceptualizing how big the number 4^3.2 billion is. If you were to type across a page of 100 letters across and 100 lines down it would take 3200 pages to write the number. If you wanted to state the sequential space of all the organisms that ever lived on earth it would take less than one additional line on page 3201.
Now your point is logical that change can be one gene at a time but still the average human gene takes around 1500 nucleotides to code an average size protein. So the possible ways to arrange the DNA code for the average protein is 4^1500. This number is smaller but still orders of magnitude larger than the number of sub atomic particles in our universe approximately 4^200. The question is how many ways can you arrange the DNA and still get the required protein function? Unless that number is close to the total possible ways to arrange the DNA then a non directed search will almost certainly fail.