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Author Topic:   Who Owns the Standard Definition of Evolution
Taq
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Posts: 10392
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Message 419 of 703 (915524)
02-14-2024 1:36 PM
Reply to: Message 418 by Tanypteryx
02-14-2024 1:10 PM


Tanypteryx writes:
Do you have some references that discuss clade selection?

Decades ago I read some of the authors that Stephen Gould wrote about that hinted at higher level selection, but I was really disappointed that I couldn't grasp what mechanisms they were proposing. Whatever is happening is not as obvious as mutations and natural selection.
Clade selection isn't in my wheelhouse, so I don't have any suggestions other than a Google Scholar search. From what little I know, clade selection is a bit hazy and lies more on the philosophical side than the objective scientific side. I would call it more of a high level concept than an actual working scientific theory.
I'm often struck by just how amazing it was that Darwin put together such a coherent theory of natural selection without understanding genetics. He understood many aspects of inheritance but seemed frustrated that he couldn't discover the underlying mechanism of genetics.

Is it possible that today, we are missing a major component of the processes of evolution similar to Darwin's missing genes? Or is it more like the minor effects of epigenetics?
It is impressive that Darwin figured out so many of the concepts that remain true to this day. The fact that so little of the theory had to be changed once genetics was understood is a testament to Darwin's insightfulness.
The unification of embryonic development and genetics is also an important one, and it has some impact on the theory. We now know that development limits what adaptations are possible, as one example. Epigenetics doesn't have that much of an impact because in the vast majority of cases it is an expression of the underlying DNA sequence meaning the sequence of bases in the genome determines epigenetic outcomes. It is essentially a different form of gene regulation. In some very limited cases there is transgenerational epigenetic inheritance, but these are limited in both effect and scope. It's more of a side show than the main act.
As of now, there doesn't seem to be any need for any big adjustments. Much like the standard model in physics, its just a lot of refining. Probably the biggest mountain to climb right now is understanding the direct connection between genotype and phenotype. Exactly how are differences in DNA sequence tied to specific differences in phenotype.

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Taq
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Posts: 10392
Joined: 03-06-2009
Member Rating: 5.5


Message 421 of 703 (915531)
02-14-2024 2:46 PM
Reply to: Message 420 by Granny Magda
02-14-2024 2:14 PM


Granny Magda writes:
Yeah, I wonder if it's a linguistic mix-up or if it's part of the broader creationist trend of denying macroevolution in any organism with a fast enough life cycle to for evolutionary change to be obvious in a practical experiment.
It does make me chuckle when they claim "that's just microevolution because they are still bacteria". That's equivalent to saying, "humans and trees sharing common ancestry is just microevolution since they are still eukaryotes".

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Taq
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Posts: 10392
Joined: 03-06-2009
Member Rating: 5.5


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Message 439 of 703 (915585)
02-15-2024 10:36 AM
Reply to: Message 423 by K.Rose
02-14-2024 5:55 PM


K.Rose writes:
We always seem to skip over the big evolution ideas, the ones depicted in schoolkids diagrams, and go straight to the observances performed through a microscope.
You said you wanted to understand evolution. Genetics is a massive part of understanding evolution.
It is not at all unreasonable to ask for a demonstration showing how a and mammal becomes a whale.
Whales are mammals.
Also, I am showing you how life evolves. That's what all this genetics stuff is.
The default is not that something is true, the default is that it has not been shown to be true.
So is that the default for your beliefs?
Also, I am showing you how evolution is true.
There have been many spectacular failures in Science - and many spectacular successes – and many of these failures are discovered when the paper studies are put into practice/experimentation, the point where the unknowns are discovered, the impetus for necessitating that a thing be repeatedly demonstrated before we celebrate.
Here are 29 repeated tests of evolution, all of which it passed.
29+ Evidences for Macroevolution: The Scientific Case for Common Descent
You just dismissed it with a handwave without even looking into it.
And why can’t a nested hierarchy be explained by Creationism? The Creator, by definition, creates everything we believe we can understand and then some.
Your inability to explain the nested hierarchy is proof. You still can't explain why Creationism would necessarily produce a nested hierarchy. However, it is the only pattern evolution can produce amongst lineages that operate through vertical inheritance.

This message is a reply to:
 Message 423 by K.Rose, posted 02-14-2024 5:55 PM K.Rose has replied

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Taq
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Posts: 10392
Joined: 03-06-2009
Member Rating: 5.5


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Message 440 of 703 (915586)
02-15-2024 10:39 AM
Reply to: Message 430 by K.Rose
02-14-2024 7:03 PM


K.Rose writes:
Take the set of all the knowledge we have amassed regarding Evolution and call that KNOWLEDGE.

Now (here's where you suspend disbelief) imagine that tomorrow we discover something that invalidates everything we have come to believe regarding molecules-to-man evolution.

How does that affect the process/products to which we have applied KNOWLEDGE? What laws, inventions, customs, and traditions would we have to re-do?
Are there any scientific theories you accept? If so, doesn't your argument apply equally to those theories?
If you don't accept any scientific theories (e.g. Germ Theory of Disease) could you explain why?

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Taq
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Posts: 10392
Joined: 03-06-2009
Member Rating: 5.5


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Message 441 of 703 (915588)
02-15-2024 11:01 AM
Reply to: Message 427 by K.Rose
02-14-2024 6:06 PM


K.Rose writes:
Suffice it to say that Science has managed to align itself with atheism when it comes to things legal, and that’s why the court ruled in favor of science. It was just another bow to atheism, not an endorsement of evolutionary theory validity.
There are many, many Christian groups that call for the rejection of Creationism in the science classroom, and the also wholeheartedly support the teaching and acceptance of evolution. Even in the Kitzmiller case there were Christians who testified for the plaintiffs, saying that ID should not be taught in science class.
Here is the Clergy Letter, signed by over 15,000 Christian clergy:
quote:
We the undersigned, Christian clergy from many different traditions, believe that the timeless truths of the Bible and the discoveries of modern science may comfortably coexist. We believe that the theory of evolution is a foundational scientific truth, one that has stood up to rigorous scrutiny and upon which much of human knowledge and achievement rests. To reject this truth or to treat it as “one theory among others” is to deliberately embrace scientific ignorance and transmit such ignorance to our children. We believe that among God’s good gifts are human minds capable of critical thought and that the failure to fully employ this gift is a rejection of the will of our Creator. To argue that God’s loving plan of salvation for humanity precludes the full employment of the God-given faculty of reason is to attempt to limit God, an act of hubris. We urge school board members to preserve the integrity of the science curriculum by affirming the teaching of the theory of evolution as a core component of human knowledge. We ask that science remain science and that religion remain religion, two very different, but complementary, forms of truth.
The Clergy Letter Project
Not to mention that there are thousands and thousands of Christian biologists who accept the theory of evolution.
My initial request was for a concise definition of Evolution. The answer has been that it’s not so easy to define (which is odd considering that every layman and schoolkid knows exactly what it is given the Zallinger’s March of Progress-type depictions they’ve been spoon fed their entire lives), and the responses have either been broad abstractions (descent with modification), or they have involved lengthy technical monographs that combine present-day data collection with assumption with speculative application to the past. Neither of these types of answers commits to something clear and absolute; they both leave the door open to evading commitment to any type of concrete definition. This is why my initial request is qualified with “concise” – there’s no point in debating phantom concepts.
No field in science can be accurately summed up in a concise definition.
In this same way the evidence for evolution presented in response to my requests is incoherent to the layman,
This is self imposed blindness. You don't want evolution to be true, so you blind yourself to the evidence.
Creationist scientists would agree fully with many of the DNA and other microbiological observations you and the others have presented. The disagreement comes when the Evolutionist extrapolates those observations to explain that all life has descended from the same initial organism(s), in direct conflict with Creation. This common descent concept is the most important element of the debate, yet the Evolutionist has precisely no direct evidence for this idea of “common descent”, just references to DNA and nested hierarchies.
First, microbiology is not the study of DNA. Microbiology is the study of microorganisms like bacteria. The phrase you are looking for is molecular biology. That is the study of DNA. Also, I have been discussing genetics in general which is not called microbiology.
Secondly, we are interpolating, not extrapolating. We have the end points which are the species living today. What we are doing is looking at the data that lies between those endpoints, and that is interpolation.
Thirdly, you are criticizing scientists for using the scientific method. You are criticizing them for doing the very thing you asked them to do. In the scientific method we hypothesize what we should and should not see in the biodiversity of living species, the biodiversity of fossil species, and the DNA sequences of species if common ancestry and evolution are true. We then see if those predictions are supported by observations. That's how science works. As expected, creationists don't like it when scientists do science. What creationists want is blind acceptance of their claims without any skepticism or testing. The very fact creationism can not produce scientific predictions is testament to this problem.
And “accepted scientific theory” is a curious designation. Accepted by whom and, most importantly, why? If it has not been proven then isn’t it just scientific theory? What does “accepted” mean, is it an attempt to claim some unearned credibility? Like the designation “settled science”, “accepted science” flies in the face of genuine scientific principles: Perpetual inquiry and relentless skepticism.
Accepted by the overwhelming majority of scientists in the field because the theory explains the facts they are observing. For example, the theory of evolution explains why we see more sequence conservation in exons than in introns. It explains why transitions outnumber transversions. It explains why we see a nested hierarchy. It explains why we see transitional fossils like those with a mixture of whale and terrestrial mammal features:
The evolution of whales - Understanding Evolution
Added in edit:
The Origin of Whales and the Power of Independent Evidence | National Center for Science Education
It also explains why we DON'T see fossils with a mixture of mammal and bird features. Creationism can't explain any of these patterns in the data. Evolution can. Scientists use the theory of evolution because it works. Creationism doesn't work because it can't explain the data.
Also, no theory becomes fact. Theories and facts are different things. Facts are the world's data. Theories explain those facts. Theories never stop being explanations.
I may be repeating myself through my entries, but the lack of clear responses demands it (if we want to move the discussion forward).
I have given you many clear responses. You ignore them.
The Evolutionist attributes his most important observations to processes that he cannot see, that he cannot explain, and that he cannot demonstrate. This is faith.
That's completely false. Mutation, selection, speciation, and common ancestry are all observed mechanisms. We see them all operating the world today. In contrast, we have never observed a single supernatural deity produce a new species. We have observed the natural mechanisms of evolution producing new species, new DNA sequences, new descendants, and nested hierarchies.

This message is a reply to:
 Message 427 by K.Rose, posted 02-14-2024 6:06 PM K.Rose has replied

Replies to this message:
 Message 446 by K.Rose, posted 02-15-2024 2:20 PM Taq has replied

  
Taq
Member
Posts: 10392
Joined: 03-06-2009
Member Rating: 5.5


(2)
Message 442 of 703 (915589)
02-15-2024 11:17 AM
Reply to: Message 426 by K.Rose
02-14-2024 5:59 PM


K.Rose writes:
I will point out that the simplified version of evolution that is presented to schoolkids is precisely the part of evolution that cannot be demonstrated, and is precisely the part that refutes Creation, and is precisely the impetus for this evcforum website.
I have given you the evidence that does demonstrate it. You ignore it. Again, nested hierarchies demonstrate that life shares common ancestry because this is the very pattern we should see if common ancestry is true. Creationism can't explain why we see this pattern instead of a different pattern.
I have shown you that the observed processes that produce mutations in living species are the very same processes that have produced the differences between the genomes of different species. That is found here:
https://www.evcforum.net/dm.php?control=msg&m=915069#m915069
and here:
https://www.evcforum.net/dm.php?control=msg&t=20367
I have shown you the data demonstrating natural selection has acted on these genomes through common descent:
https://www.evcforum.net/dm.php?control=page&t=20463&mpp=...
It's been demonstrated.

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Taq
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Posts: 10392
Joined: 03-06-2009
Member Rating: 5.5


(2)
Message 443 of 703 (915595)
02-15-2024 1:26 PM


K.Rose recommended reading
K.Rose,
If you are looking for a Christian perspective on evolution I would suggest the following essay:
https://www.asa3.org/ASA/PSCF/2003/PSCF9-03Collins.pdf
It is written by Dr. Francis Collins who is a devout Christian. He headed the Human Genome Project and was head of the National Institutes of Health for quite some time. He discusses both the evidence for evolution, and what it means for his Christian beliefs. There's also this quote from the essay:
"Outside of a time machine, Darwin could hardly have imagined a more powerful data set than comparative genomics to confirm his theory."--Dr. Francis Collins, "Faith and the Human Genome"

  
Taq
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Posts: 10392
Joined: 03-06-2009
Member Rating: 5.5


(1)
Message 453 of 703 (915614)
02-15-2024 3:16 PM
Reply to: Message 446 by K.Rose
02-15-2024 2:20 PM


K.Rose writes:
The court case is knocking us off-track. It doesn't support/refute common ancestry and the craven behavior of those who should know better doesn't mean anything. The court thing shouldn't have been introduced to the discussion and I certainly shouldn't have replied to it. My apologies.
The one thing I am hoping you take away from what I wrote is that there are many, many Christians who accept evolution. Evolution is no more atheistic than the Germ Theory of Disease or the Theory of General Relativity.
K.Rose writes:
I'll allow that you can interpolate data points, but you are extrapolating present-day processes to explain ancient, unobserved occurrences.
That's how science is done. We hypothesize about what we can't directly observe. Part of that hypothesis is to predict what we should should and shouldn't see in what we can directly observe. Again, you appear to be criticizing scientists for doing science. The whole point of doing science is to understand the processes we can't directly observe. This is why we have scientists and not observationalists.
The "clear" responses I've received involve exrons, introns, transition/transverion, nested hierarchy, links to essays - These are intriguing words, but I'm not looking for a lengthy argument that I'm supposed to use to convince myself - after firming up my biological background. I'm looking for a demostration or solid proof of these ancient, extrapolated occurrences.
The solid proof is the exons/introns, transitions/transversions, nested hierarchies, and the rest of the evidence I have been discussing. This is the evidence that convinced the scientific community that evolution is true. Whether or not you attempt to understand this evidence is up to you, but if you want to understand why the scientific community is convinced then you will need to understand this evidence. If you want to just mock scientists and handwave the evidence away, that's your choice.

This message is a reply to:
 Message 446 by K.Rose, posted 02-15-2024 2:20 PM K.Rose has replied

Replies to this message:
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Taq
Member
Posts: 10392
Joined: 03-06-2009
Member Rating: 5.5


Message 454 of 703 (915615)
02-15-2024 3:22 PM
Reply to: Message 451 by K.Rose
02-15-2024 3:06 PM


K.Rose writes:
I have looked at "29+ Evidences for Macroevolution". It's a 41,000+ word document not including references, et al., (avg novel: 50-100K words) and it's not an easy read. So, no, I have not devoted the time and energy to comprehending the argument.
There's lots of words because there's lots of evidence. Handwaving it away because you don't think it is aimed at the layperson is just dismissive. I do agree that some of the topics can be difficult to understand, but this is the level of knowledge one would need in order to even begin to criticize the theory. What I hope you take away from this is that scientists aren't just assuming evolution is true. There are mountains and mountains of data that we are looking at, as well as subjects that you probably weren't familiar with before participating in this thread.
One of the sections that may be aimed more at your interests is the section on transitional fossils:
29+ Evidences for Macroevolution: Part 1
Specifically, hominid transitional fossils:
quote:
(A) Pan troglodytes, chimpanzee, modern
(B) Australopithecus africanus, STS 5, 2.6 My
(C) Australopithecus africanus, STS 71, 2.5 My
(D) Homo habilis, KNM-ER 1813, 1.9 My
(E) Homo habilis, OH24, 1.8 My
(F) Homo rudolfensis, KNM-ER 1470, 1.8 My
(G) Homo erectus, Dmanisi cranium D2700, 1.75 My
(H) Homo ergaster (early H. erectus), KNM-ER 3733, 1.75 My
(I) Homo heidelbergensis, "Rhodesia man," 300,000 - 125,000 y
(J) Homo sapiens neanderthalensis, La Ferrassie 1, 70,000 y
(K) Homo sapiens neanderthalensis, La Chappelle-aux-Saints, 60,000 y
(L) Homo sapiens neanderthalensis, Le Moustier, 45,000 y
(M) Homo sapiens sapiens, Cro-Magnon I, 30,000 y
(N) Homo sapiens sapiens, modern

This message is a reply to:
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Replies to this message:
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Taq
Member
Posts: 10392
Joined: 03-06-2009
Member Rating: 5.5


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Message 458 of 703 (915619)
02-15-2024 3:44 PM
Reply to: Message 449 by K.Rose
02-15-2024 2:41 PM


K.Rose writes:
Interesting that you point out the disinterest biologists have in whether or not school kids or the general public understand evolution. This is where the entire evc contention is summed up: Evolution is presented as fact to an unwitting audience. And it's essentially mandatory curriculum in most industrialized societies.
Evolution is both fact and theory just as gravity is both fact and theory.
quote:
Well, evolution is a theory. It is also a fact. And facts and theories are different things, not rungs in a hierarchy of increasing certainty. Facts are the world's data. Theories are structures of ideas that explain and interpret facts. Facts do not go away when scientists debate rival theories to explain them. Einstein's theory of gravitation replaced Newton's, but apples did not suspend themselves in mid-air, pending the outcome. And humans evolved from apelike ancestors whether they did so by Darwin's proposed mechanism or by some other, yet to be discovered.
Moreover, "fact" does not mean "absolute certainty." The final proofs of logic and mathematics flow deductively from stated premises and achieve certainty only because they are not about the empirical world. Evolutionists make no claim for perpetual truth, though creationists often do (and then attack us for a style of argument that they themselves favor). In science, "fact" can only mean "confirmed to such a degree that it would be perverse to withhold provisional assent." I suppose that apples might start to rise tomorrow, but the possibility does not merit equal time in physics classrooms.
Evolutionists have been clear about this distinction between fact and theory from the very beginning, if only because we have always acknowledged how far we are from completely understanding the mechanisms (theory) by which evolution (fact) occurred. Darwin continually emphasized the difference between his two great and separate accomplishments: establishing the fact of evolution, and proposing a theory—natural selection—to explain the mechanism of evolution. He wrote in The Descent of Man: "I had two distinct objects in view; firstly, to show that species had not been separately created, and secondly, that natural selection had been the chief agent of change. . . . Hence if I have erred in . . . having exaggerated its [natural selection's] power . . . I have at least, as I hope, done good service in aiding to overthrow the dogma of separate creations."
--Stephen Jay Gould, "Evolution as Fact and Theory"
https://wise.fau.edu/...s/knowing/gould_fact-and-theory.html
And you still haven't told us why students shouldn't be taught about a theory that is accepted by more than 99% of biologists. Almost nothing in biology makes sense outside the theory of evolution, as Dobzhansky once quipped, and it's true. Why does everything with three middle ear bones also have fur? Evolution explains it. Why does everything with feathers have just one middle ear bone? Evolution explains it. Why don't we see species that lactate and have flow through lungs? Evolution explains it. Creationism can't explain any of this. One of the important subjects that biology students are taught is the overall picture of taxonomy. The fact that species nest within genera, genera nest within families, families nest within orders, and orders nest within classes, classes nest within phyla, and phyla nest within kingdoms is only explained by evolution and common ancestry. There is absolutely no reason we should see this pattern if Creationism is true.
1. How would you explain evolution to a 4th-grade class?
I would start with natural selection. There are differences between individuals within a species, and those differences that give the individuals an advantage tend to have more offspring. This causes those advantages to become more and more common within the species.
How would you explain evolution to a 10th-grade class?
This is where I would introduce the nested hierarchy which is seen in both taxonomy and cladistics. This explains common ancestry and why we see the combination of features we see in these groups. Why do we see transitional fossils between reptiles and mammals but not between mamals and birds? Why are all mammals also vertebrates? What is the common ancestral group for mammals and fish?
Almost all of the evidence for evolution is tied to understanding how nested hierarchies work, so that is the first concept that needs to be taught.
3. How would you explain evolution to a non-biologist adult with a somewhat technical background?
I would present the evidence I have presented here, including the pattern of substitutions, patterns of sequence conservation, and once again the importance of the nested hierarchy. We could also include shared endogenous retroviruses, which is discussed here:
29+ Evidences for Macroevolution: Part 4
and here:
https://www.evcforum.net/dm.php?control=msg&t=20370
And then what would you use to demonstrate the explanation?
The fit between the predictions made by the theory and the observations that are made is the demonstration.

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Taq
Member
Posts: 10392
Joined: 03-06-2009
Member Rating: 5.5


Message 459 of 703 (915620)
02-15-2024 3:55 PM
Reply to: Message 450 by K.Rose
02-15-2024 2:52 PM


K.Rose writes:
What was the first ancestor? How many were there? Did life spring forth from inanimate materials/rock. Or maybe there is concurrence on these, you tell me.
The first ancestor is often called LUCA which stands for Last Universal Common Ancestor. This was at least a species with a larger population, but could have also been a whole group of species that passed different features between them. LUCA was definitely not the first life to appear on Earth.
LUCA would have had, at a minimum, the shared metabolic pathways seen in all life and the shared genetic systems shared by all life. I spoke earlier about the relationship between protein translation and tRNA's. This is one of the evidences for a single common ancestor for life since the relationship between codon and amino acid is mostly arbitrary and could have been different for different groups if life had more than one origin or more than one ancestor.
The theory of evolution itself makes no claims about how the first life came about. If God created the first simple replicators that evolved into the biodiversity we see today then not one word of the theory would need to be changed.
This lack of concurrence inarguably throws doubt into the idea that mankind evolved from something else a very long time ago.
Why? That's like saying we can't know what happened yesterday because we don't know every fine detail of what happened on this date 50,000 years ago. We have tons and tons of data demonstrating shared ancestry between humans and other primates.

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Taq
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Posts: 10392
Joined: 03-06-2009
Member Rating: 5.5


Message 463 of 703 (915625)
02-15-2024 4:34 PM
Reply to: Message 462 by Percy
02-15-2024 4:26 PM


Percy writes:
I know your message has already been answered a couple times, but I'd like to give this a try.
There are some good experiments 4th graders could partake in, one of which teaches students how natural selection works.
https://www.dentonisd.org/...%20Evolution%20ActivityDATA.pdf
In this example, one of the students spreads out a bunch of differently colored toothpicks on a patch of grass. The other student is then asked to act like a predator and grab the first toothpicks they see. What the students will find is that they will prey upon the green toothpicks the least compared to the other colors. It would also be interesting to see results from colorblind students.

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 Message 462 by Percy, posted 02-15-2024 4:26 PM Percy has replied

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 Message 468 by dwise1, posted 02-15-2024 5:09 PM Taq has replied

  
Taq
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Posts: 10392
Joined: 03-06-2009
Member Rating: 5.5


Message 467 of 703 (915629)
02-15-2024 4:45 PM
Reply to: Message 464 by K.Rose
02-15-2024 4:35 PM


K.Rose writes:
Thank you for the pictures, now maybe we're beginning to get somewhere. Which of those skulls represent creatures that could, if they were here, procreate with modern humans?
We have evidence for rare interbreeding between neanderthals and modern humans. I believe some H. erectus survived long enough to co-exist with modern humans, but I haven't seen any evidence for divergent regions of the human genome that would be consistent with cross breeding between modern humans and H. erectus. The other species were not around at the same time as H. sapiens, so we simply don't know. As icky as it sounds, it may even be possible for chimps and humans to interbreed.
And if we were to group the skulls according to "procreateability" among members of the group, what would the groupings look like?
That group may include chimps and gorillas for all we know.
What we do know is that hominid species started out looking very much like earlier apes, and over time became more and more human-like. This is exactly what we would expect to see if humans share a common ancestor with other apes.

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 Message 464 by K.Rose, posted 02-15-2024 4:35 PM K.Rose has not replied

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Taq
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Posts: 10392
Joined: 03-06-2009
Member Rating: 5.5


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Message 470 of 703 (915637)
02-15-2024 5:16 PM
Reply to: Message 469 by Tangle
02-15-2024 5:10 PM


Tangle writes:
A long time ago I did a degree in Zoology. We did a field course that had two objectives.
It is also worth mentioning that (of course) nature has already done this type of experiment.
Mice found in volcanic areas with black basalt are black while those found out in the sandy desert are sand colored. There is free interbreeding between the populations at the borders of the volcanic areas, but natural selection keeps the obvious imbalances.
The genetic basis of adaptive melanism in pocket mice

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Taq
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Posts: 10392
Joined: 03-06-2009
Member Rating: 5.5


(1)
Message 471 of 703 (915639)
02-15-2024 5:21 PM
Reply to: Message 468 by dwise1
02-15-2024 5:09 PM


dwise1 writes:
I would guess that for them the red ones would blend in with the grass equally as well as the green ones, so colorblindess would be selected against in those predators (ie, they would starve since they couldn't find their food).
My grandfather was colorblind and was posted to an air field in Italy during WWII. He claims that they would take him and other colorblind soldiers on scouting runs because camouflage is less effective if you are colorblind. Don't know how true that is, but it was a great grandpa story.

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