I’m failing to see how homologous structures and genetic similarity, by themselves, prove beyond a reasonable doubt that humans and primates share a common ancestor rather than reflecting a common blueprint, common constraints, or common design principles interpreted through a different framework.
The existence of shared genetic and anatomical features is not really in dispute. The question is what best explains those similarities.
A common descent model interprets them historically through inheritance from shared ancestors. A common archetype/design framework interprets them structurally through reuse of conserved organizational patterns.
So the real issue is not whether similarities exist, but whether the evidence uniquely favors one explanatory framework over the other.
More importantly, if common descent is being presented as the superior scientific explanation, then it should also be clear:
what observations would falsify it,
what predictions uniquely distinguish it from alternative structural/design interpretations,
and what evidence could not be accommodated within the current evolutionary framework.
For example, if both models can account for homologous structures, shared genes, and nested similarities, then what specific evidence decisively rules one out while confirming the other?
That is the actual point under debate — not whether genetics demonstrates similarity, but whether similarity alone logically necessitates common ancestry over every competing explanatory framework.
I would say the existence of endogenous retroviruses in human and chimp DNA and more importantly the pattern of similarities and differences would be hard to explain in the ID framework.
There is a several threads on the forum on this topic including Why aren’t the twin locations of >100k+ ERVs (human vs chimp) discussed more
It’s interesting you bring up ERVs, because I actually think they highlight some of the broader complications within a strictly tree-like common descent framework.
I agree that shared ERV insertion patterns between humans and chimps are often presented as strong evidence for common ancestry. But modern genomics has also revealed that evolution is not purely vertical inheritance. Horizontal gene transfer (HGT), viral integration, modular recombination, and convergent co-option complicate the idea of a clean, singular “Tree of Life.”
For example:
RNA viruses likely played a major role in shaping genomes through gene transfer and genomic restructuring.
ERV-derived elements are sometimes independently co-opted for functional roles across different mammalian lineages.
Viral and genomic evolution often involve network-like interactions rather than strictly branching inheritance.
That doesn’t automatically refute common ancestry, but it does suggest the evolutionary picture may be more structurally and modularly complex than a simple Darwinian tree model.
My broader point is not that ERVs are weak evidence, but that they may fit within multiple explanatory frameworks depending on how one interprets genomic organization, constraint, modularity, and convergence.
So the question is not simply:
“Do shared ERVs exist?”
The deeper question is:
“Do shared ERVs uniquely and decisively prove universal common ancestry to the exclusion of alternative structural or constraint-based interpretations?”
Given the list of examples I gave, this doesn’t seem to be the case at all.
Since to date no one has offered any alternative structural or constraint-based interpretations for ERVs that holds up under even the most cursory inspection, it’s fair to say that, yes, they are indeed strong evidence for common descent.
If you think your list of examples actually undercuts ERVs as evidence for common descent, please make the argument. Because I don’t see the logic at all.
Not very good examples. Where is that hand waving emoji when you need it. You didn’t address why we would find so many in identical locations.
The actual question is why would 100k ERV insertions (which are random locations) exactly match between chimp and human DNA. Finding a few that match due to chance would be one thing. Finding 100k places that in the realm of they are there because they were copied from a single source. Or the designer chose to copy them to give us the mistaken idea of common descent.
And you also need to address why the small number of differences exist.
And no one is suggesting ERVs lack function. Some do, but most are just fossil DNA.
Incorrect, at least in my unvarying experience. A common archetype/design framework alludes vaguely to conserved organizational patterns and never actually interprets any of the features. I’ve never seen an ID proponent explain any feature of any genome or anatomy. Why do the shared features show the patterns they do? Why, for example, are the diverse group of Hawaiian honeycreepers more similar genetically to one another than they are to any other species? Why were Australian mammals almost exclusively marsupials? Why do some species share the same processed pseudogenes in the same places in their genomes? Why do humans get goosebumps when they’re scared? Why do different ERVs from the same viral family differ in how diverged they are genetically from one another, and why does the degree of divergence correlate so well with how widely those ERV insertions are shared across species?
Common descent gives detailed answers to all of these questions and a huge range of others. ID doesn’t. That’s why scientists ignore not – not because of some prejudice against it, but because it’s useless.
Actually, “Do shared ERVs exist?” is in and of itself a decisive question. We do know how they come about, we observe an epidemic in real time involving an endogenous retroviruses in the Koala bear population. In what world can an infectious agent running rampant in the DNA without any intentionality, constitute an alternative structural or constraint-based agency of divine creation? That makes no sense whatsoever. That is not deeper, that is refusing to recognize what is plain.
The genomes of all higher organisms are littered with the remnants of past retroviral infections, some dating back many tens of millions of years. The unique replication cycle of retroviruses, involving the integration of viral genetic information into host-cell DNA as a provirus, allows the formation of a permanent association between the virus and the infected cell. If the infected cell is a germ cell, then that genetic association can persist for many generations, with the provirus forming part of the genome of every cell in progeny.
Until now, we have never had the opportunity of observing or studying such genomic colonization as it takes place. Enter the koala - an Australian icon and a potentially endangered species. A recent paper in Nature by Tarlington and colleagues provides evidence that koalas are in the midst of a germline invasion by the koala retrovirus (KoRV).
No, that is not my main point. My primary argument is that ERVs do not uniquely undercut common design/archetype interpretations simply because they are often interpreted through a common ancestry framework.
That said, I do think there are reasons why ERVs and viral evolution complicate a strictly tree-like common descent model.
For example, modern genomics has increasingly shown that evolution is not always a clean process of vertical inheritance. Horizontal gene transfer (HGT), viral integration, modular recombination, and convergent genomic co-option can blur phylogenetic relationships by introducing genetic material across unrelated lineages rather than exclusively through parent-offspring descent.
RNA viruses are particularly interesting in this regard because:
they likely played a major role in shaping genomes,
they cannot be neatly integrated into the traditional Tree of Life due to their non-cellular nature,
and viral evolution itself appears highly network-like and polyphyletic rather than strictly tree-like.
In addition, endogenous retroviral elements are not always merely inactive genomic “fossils.” Some ERV-derived sequences have been independently co-opted for regulatory or functional roles across different mammalian groups.
My point is not that this disproves common ancestry outright. Rather, it suggests that the evolutionary picture may be more structurally modular, reticulate, and constraint-driven than a simple branching tree model alone would imply.
So when ERVs are presented as decisively ruling out alternative frameworks, I think that conclusion goes beyond what the evidence alone necessarily establishes.
Again, Owen’s theory already explained all this before Darwin came along to reinterpret it to mean it proves common descent.
Here is a snippet of the article I mentioned that briefly explains the theory and history behind it:
In the mid-19th century, Richard Owen and Charles Darwin proposed contrasting explanations for biological diversity. Owen argued that recurrent structural motifs across vertebrates reflect underlying generative laws rather than purely genealogical inheritance [1,2]. Darwin, by contrast, emphasized historical processes—namely, common descent and natural selection [2, 3]. Owen’s concept of a common archetype presents a fundamental structural blueprint that can be adaptively modified while retaining a shared organizational logic.
While Darwin attributed biological complexity to natural selection acting on random variation [2,3], Owen sought a deeper explanatory framework to account for the unity of structure observed across vertebrate forms. Owen argued that vertebrae are homotypic owing to a “vegetative repetition of a single vertebral element” [1]. These serially repetitive elements can then be teleologically modified, each acquiring distinct functions while preserving the underlying homology, often discernible only to trained observers. Notably, Owen acknowledged the limits of his knowledge. In the closing paragraph of On the Nature of Limbs, he notes, “To what natural laws or secondary causes the succession and progression of such organic phenomena may have been committed we as yet are ignorant” [1].
More than 150 years later, developments in molecular evolution, quantum biology, and viral genomics offer candidate mechanisms for the laws or secondary causes Owen anticipated. For example, the convergent co-option of endogenous retroviral genes, which are repurposed independently across multiple mammalian orders [4,5], parallels Owen’s notion of the “vegetative repetition of a single vertebral element” [1], in which a conserved structural module can be repeatedly adapted for new functions. Similarly, modular recombination and horizontal gene transfer can be interpreted not as mere accidents but as adaptive mechanisms operating within structural constraints, enabling viruses and host genomes to respond flexibly to environmental pressures [6,7].
Other researchers have recognized this pattern [8,9]: Gilbert [9], for instance, emphasized the deep molecular unity shared across all organisms, arguing that such universality reflects an underlying organizational plan consistent with Owen’s structural framework. The conceptual continuity between Owen’s archetype and modern modular genetic systems motivates a deeper structuralist reinterpretation. [emphasis added]
Here is a snippet of the article that explains why we see differences within Owen’s model compared to Darwin’s:
Owen’s adaptive masks describe outward variation that modulates or partially obscures the deeper unity of form [1]. Darwinian natural selection and Owen’s adaptive mask differ fundamentally in their treatment of biological form. In Darwin’s framework, adaptive change arises through the differential survival of randomly generated variations, with form emerging historically from population-level processes[2]. By contrast, Owen’s adaptive mask operatesupon a pre-existing archetypal structure, allowing functional and environmental modification without altering the underlying organizational plan. Adaptation, in Owen’s view, modifies the expression of form rather than generating it de novo[2]. This distinction preserves empirical adaptability while maintaining intrinsic structural constraint, situating biological variation within law-governed limits rather than open-ended historical contingency.
In our reinterpretation, adaptive masks are conceptually associated with decoherence, whereby environmental interactions drive quantum systems toward effectively classical outcomes (see Appendix). In this reading, adaptive masks capture how underlying structural constraints become differentially expressed under specific ecological, developmental, or physiological conditions, without negating the persistence of archetypal organization.
Yes, there are many drivers of evolution and regulatory expression, and recombination is one, which is why evolution is a pervasive and inexorable imperative in biology. ERVs elicit selective responses, as would be expected with Koala’s generally suffering up to 60% mortality.
It is ridiculous to argue that epidemic ERV insertions in the DNA are due random infection, but no, not those fixed ERV insertions; ad hoc those are deemed special creation because they will be needed to protect against other future ERV insertions. To begin with, who created the pathogenic KoRVA that would necessitate ERV sequences in the DNA? No pathogen, no need for prophylactic. As opposed to structural narratives, evolution yields an coherent explanation for all of it, the infectious agent, the phylogeny pattern of Koala DNA, the ERV insertions, and the mitigating (albeit generally ineffective) effects of recombination.
It has already been explained in their human origins model:
A common objection to any model invoking design is the existence of pain, suffering, disease, death, and other forms of so-called “natural evil” [45,46]. Our framework proposes three responses:
1. Moral Agency and Theological Considerations: Some forms of suffering may be indirectly linked to human moral failings or the misuse of free will [47, 48, 49, 50].
2. Thermodynamic and Ecological Constraints: Decay and predation reflect necessary consequences of physical laws governing our universe. The second law of thermodynamics appears to be universal [7]. Such constraints are essential to ecological stability [50, 51, 52]. Certain forms of suffering arise as a necessary implication of the world’s lawful structure.
3. Reinterpretation of Alleged “Malevolent Designs”: Features such as cancer, viruses, and pain are being reinterpreted as functionally integrated elements [53, 51, 54, 55]. Viruses are essential drivers of gene transfer and ecosystem balance [55]. Persistent pain and nociceptor hyperactivity can have adaptive value, promoting hypervigilance and survival after injury, and share mechanisms with learning and memory processes [56]. Cannibalism and extinction are part of ecological restructuring [57, 58, 59, 60]. Even black hole radiation reflects deeper quantum-field dynamics [61]. Critics use these to argue against design [45, 46], yet discovery of their functional significance suggests many “flaws” are necessary trade-offs within an integrated cosmos.
Yes. Evolution and branching ancestry is an unavoidable and necessary consequence of physical laws and emergent properties governing biology. That happens in the present as with the Koala ERV epidemic, and the record demonstrates that it has happened in the past. It does not stop with ad hoc boundaries.
No, these are arguments for the dynamics of evolution, which is simply biology over time. Design or the lack thereof does not even register in the analysis.
You say that but you never answered my question about it……..
Does common descent predict frequent conflicts between morphological and molecular phylogenies that are concentrated at deep nodes corresponding to early divergences among major vertebrate groups?
Should I have responded, I expect that you would just whiff on the molecular confirmation of the morphological nested hierarchy as reflecting reuse of design components anyways. You do you. I disagree with your characterization and will just leave it at that. I have more pressing things to do than to address every red herring out there.
I specifically asked whether common descent predicts frequent conflicts between morphological and molecular phylogenies concentrated at deep vertebrate nodes.
That is a methodological question about the explanatory expectations of the model itself, not a “red herring.”
If the answer is yes, then I’d be interested in how those conflicts are theoretically expected and resolved within the framework. If the answer is no, then the concentration of such conflicts at deep nodes becomes relevant to the discussion.