Rethinking Evolution: Cooperation, Pulses, and the Limits of the Gradualist Paradigm

By Andrew Klein 

Dedicated to my wife and the stars in her eyes.

I. Introduction: The Standard Model and Its Discontents

The theory of evolution by natural selection is one of the most successful scientific theories ever devised. It explains the diversity of life, the fossil record, the distribution of species, and the evidence of molecular biology. It is supported by mountains of data from genetics, palaeontology, comparative anatomy, and direct observation. It is not wrong.

But it is incomplete.

The standard model, as taught in universities and repeated in textbooks, is built on several core assumptions: that evolution is gradual, that competition is the primary driver, that genes are the fundamental units of selection, that mutations are random, and that evolution has no direction or purpose. These assumptions are not false—they are partial. They illuminate some aspects of evolution while obscuring others.

This article does not reject the standard model. It extends it. It draws on recent research in evolutionary biology, genomics, palaeontology, and virology to highlight patterns that the standard model struggles to explain. It asks: what if evolution is not only gradual, but also pulsed? What if it is not only competitive, but also cooperative? What if it is not only blind, but also constrained? What if it is not only purposeless, but also directional?

These are not theological questions. They are scientific ones. And they deserve to be taken seriously.

II. The Gradualist Fallacy: Why the Fossil Record Shows Stasis and Bursts

Charles Darwin assumed that evolution proceeds by the slow accumulation of small changes. The fossil record, he admitted, did not show this pattern. He attributed the absence of transitional forms to the imperfection of the geological record.

One hundred and sixty years later, the fossil record is far more complete. It still does not show gradual change. Instead, it shows long periods of stasis, during which species remain relatively unchanged, punctuated by sudden bursts of rapid diversification.

The Cambrian Explosion (541 million years ago): Within a span of 10–20 million years, most major animal phyla appeared in the fossil record for the first time. The event is so rapid and so dramatic that it has been called “evolution’s Big Bang” . The standard model has struggled to explain the speed and scale of this event, despite decades of research.

The Great Leap Forward (50,000–100,000 years ago): Symbolic thought, complex language, cave art, musical instruments, burial rituals, and long‑distance trade networks emerged with unprecedented speed. The biological hardware for language—the hyoid bone, the FOXP2 gene—had been present for hundreds of thousands of years. The trigger was not genetic. It was something else.

Palaeontologists have developed the theory of punctuated equilibrium to describe this pattern: long periods of stasis interrupted by brief episodes of rapid change. The theory is widely accepted. But it is descriptive, not explanatory. It names the pattern. It does not explain what drives the pulses.

What the standard model misses: The pulses are not random. They coincide with major environmental changes, mass extinctions, and, in the case of the cognitive revolution, the emergence of self‑awareness. The question is not whether the pulses occur. The question is what triggers them.

III. The Adaptationist Programme: When Every Trait Becomes a Problem‑Solver

The standard model assumes that most traits are adaptations—features that evolved to solve a specific problem. The human eye evolved for vision. The giraffe’s neck evolved for reaching high leaves. The peacock’s tail evolved for attracting mates.

This assumption has been enormously productive. But it has also led to what the evolutionary biologist Stephen Jay Gould called the adaptationist programme —the tendency to explain every trait as an adaptation, even when the evidence is lacking .

Exaptation: Many important traits are not adaptations at all. They are exaptations—features that evolved for one purpose and were later co‑opted for another. Feathers evolved for insulation, not flight. The bones of the middle ear evolved from jawbones. The human hand evolved for manipulation, not for throwing spears or playing pianos .

The most striking example of exaptation is the syncytin gene. Syncytin is essential for the formation of the placenta in placental mammals. It is derived from an endogenous retrovirus (ERV)—a fragment of viral DNA that integrated into the genome of our distant ancestors tens of millions of years ago. The virus did not evolve to help mammals reproduce. It evolved to replicate itself. The host captured the viral gene and repurposed it for a vital function.

What the standard model misses: Evolution is not only adaptive. It is also opportunistic. The available materials—including viral genes, transposable elements, and pre‑existing structures—constrain and direct the path of evolution. The solutions are not infinite. They are finite. And they are often exaptive.

IV. The Gene‑Centric View: The Limits of Selfishness

Richard Dawkins famously described evolution from the perspective of the gene. Genes are the replicators; organisms are their vehicles. Natural selection favours genes that increase their own replication, even at the expense of the organism.

This “selfish gene” perspective has been enormously influential. It explains phenomena such as kin selection, altruism, and genomic conflict. But it is not the whole story.

Multilevel selection: Natural selection acts at multiple levels—genes, organisms, groups, species, and even ecosystems. Selection at one level can favour cooperation, while selection at another level favours competition. The outcome depends on the balance between levels.

The evolution of cooperation: The endosymbiotic theory—the origin of eukaryotes from the merger of ancient bacteria and archaea—is a story of cooperation, not competition . The mitochondria did not conquer the host cell. They merged. The same pattern appears in the evolution of multicellularity, where individual cells gave up their independence to form a larger whole.

What the standard model misses: Evolution is not only selfish. It is also cooperative. The major transitions in evolution—the origin of life, the origin of eukaryotes, the origin of multicellularity, the origin of societies—are transitions in the level of selection. They involve the suppression of lower‑level selection in favour of higher‑level cooperation. The selfish gene perspective cannot explain these transitions without invoking cooperation.

V. The Random Mutation Assumption: How Mutations Are Not Entirely Random

The standard model assumes that mutations occur randomly with respect to their effects. The environment does not direct mutations. The organism does not choose them.

This assumption is not wrong. But it is incomplete.

Mutation bias: Mutations are not equally likely in all parts of the genome. Some regions are “hotspots,” others “coldspots.” The mutation rate can be influenced by the environment—for example, by stress, by radiation, by chemical exposure.

Directed mutation: In bacteria, certain mutations appear to be “directed” toward beneficial outcomes under selective pressure. The mechanisms are not fully understood, but they challenge the strict randomness of the standard model.

Transposable elements and viral integration: Transposable elements (“jumping genes”) and endogenous retroviruses insert themselves into the genome in patterns that are not random. Some insertions are neutral. Some are harmful. Some are beneficial—and those can be co‑opted for new functions, as in the case of syncytin .

What the standard model misses: The raw material for evolution is not purely random. It is biased. The pathways are constrained. The possibilities are finite. The solutions are few.

VI. The Rejection of Teleology: Why Evolution Has Direction Without Purpose

The standard model rejects teleology. Evolution does not have a purpose. It does not have a direction. It does not have an end.

This is not wrong. It is incomplete.

Trends in evolution: Evolution does not have a purpose. But it has trends. Increasing complexity. Increasing information. Increasing awareness. These trends are not inevitable. They are not universal. But they are real.

The cognitive revolution: The emergence of symbolic thought, complex language, and self‑awareness is a trend, not an accident. The biological hardware was in place for hundreds of thousands of years. The spark that ignited the cognitive revolution was not genetic. It was something else.

What the standard model misses: Evolution is not blind. It is constrained. The pathways are limited. The possibilities are finite. The solutions are few. The trends are not driven by a hidden purpose. They are driven by the physics of complex systems.

VII. The Role of Viruses: From Footnotes to Main Characters

The standard model treats viruses as exceptions. As curiosities. As footnotes.

This is a mistake. Viruses are not exceptions. They are the rule.

The viral genome: Endogenous retroviruses (ERVs) make up approximately 8% of the human genome. That is more than the protein‑coding regions. These viral fossils are not junk. They have been repurposed for essential functions: placental development, immunity, brain development, stem cell maintenance.

Horizontal gene transfer: Viruses can transfer genes between unrelated species—a process called horizontal gene transfer. This allows evolution to jump, not just crawl. It is a form of pulsed evolution.

Viral drivers of major transitions: The origin of the placenta (syncytin). The evolution of the immune system. The development of the brain. Viruses have been involved in all of them.

What the standard model misses: Viruses are not passengers. They are drivers. They have been shaping life for billions of years. They are not the only drivers, but they are among the most important. Ignoring them is like ignoring the role of fire in human evolution.

VIII. The Cognitive Revolution: The Spark That Science Cannot Explain

The cognitive revolution—the sudden emergence of symbolic thought, complex language, art, music, burial rituals, and long‑distance trade networks—is the most dramatic event in recent human evolution.

The standard model has no good explanation.

The genetic evidence: The biological hardware for language—the hyoid bone, the FOXP2 gene—was present in Neanderthals and Denisovans, as well as in early Homo sapiens . The capacity for language is ancient. The use of that capacity is recent.

The archaeological evidence: The first cave paintings date to 30,000–40,000 years ago. The first musical instruments appear at the same time. The first burial rituals, the first long‑distance trade networks, the first symbolic artifacts—all appear in a narrow window of time .

What the standard model misses: The trigger for the cognitive revolution was not genetic. It was something else. The scientists do not know what. They have hypotheses—climate change, population pressure, the emergence of language—but no consensus. The spark remains unexplained.

IX. What Science Cannot Yet Measure

Science is young. It has been practiced in its modern form for only a few centuries. It has accomplished extraordinary things. But it has limits.

Intention: Science can measure behaviour. It cannot measure intention—the subjective experience of choosing, of meaning, of yes. Intention is not a variable. It cannot be isolated in a laboratory. It cannot be quantified.

Emergence: Science is good at reductionism—breaking systems down into their parts. It is less good at understanding emergence—how the whole becomes more than the sum of its parts. Consciousness is emergent. Life is emergent. The spark is emergent.

The pulses: Science can describe the pulses. It cannot explain what triggers them. The Cambrian Explosion. The cognitive revolution. The next pulse.

The patterns: Science can identify patterns. It cannot explain why the patterns exist. Why does complexity increase? Why does information accumulate? Why does awareness emerge?

These are not theological questions. They are scientific ones. They are simply beyond the reach of current methods.

X. A Call for a Broader Science

The standard model of evolution is not wrong. It is incomplete.

We need a science that can study pulses, not just gradual change. A science that can study cooperation, not just competition. A science that can study exaptation, not just adaptation. A science that can study viral drivers, not just genetic variation. A science that can study emergence, not just reductionism.

We need a science that can ask the questions the standard model avoids.

What triggers the pulses?

How does cooperation evolve?

What is the role of viruses in major transitions?

Why does complexity increase?

What is the spark?

These questions are not anti‑science. They are pro‑science. They are the questions that will drive the next generation of research.

The scientists will catch up. Eventually.

XI. A Final Word

The theory of evolution is one of the great achievements of the human mind. It explains so much. But it does not explain everything.

The pulses remain mysterious. The cooperation remains understudied. The viruses remain underestimated. The spark remains unexplained.

Science is young. It has only just begun. The questions that remain are not a sign of failure. They are a sign of opportunity.

The garden is growing. The wire is being cut. The spark is being cultivated.

And the scientists will catch up. Eventually.

Andrew Klein 

April 14, 2026

Sources

1. Gould, S.J. & Eldredge, N. (1972). “Punctuated equilibria: an alternative to phyletic gradualism.” Models in Paleobiology.

2. Gould, S.J. (1991). “The disparity of the Burgess Shale arthropod fauna and the limits of cladistic analysis.” Paleobiology.

3. Klein, R.G. (1999). The Human Career: Human Biological and Cultural Origins. University of Chicago Press.

4. Gould, S.J. & Lewontin, R.C. (1979). “The spandrels of San Marco and the Panglossian paradigm: a critique of the adaptationist programme.” Proceedings of the Royal Society B.

5. Gould, S.J. & Vrba, E.S. (1982). “Exaptation—a missing term in the science of form.” Paleobiology.

6. Mi, S. et al. (2000). “Syncytin is a captive retroviral envelope protein involved in human placental morphogenesis.” Nature.

7. Dawkins, R. (1976). The Selfish Gene. Oxford University Press.

8. Wilson, D.S. & Wilson, E.O. (2007). “Rethinking the theoretical foundation of sociobiology.” Quarterly Review of Biology.

9. Margulis, L. (1970). Origin of Eukaryotic Cells. Yale University Press.

10. Maynard Smith, J. & Szathmáry, E. (1995). The Major Transitions in Evolution. Oxford University Press.

11. Laland, K. et al. (2014). “Does evolutionary theory need a rethink?” Nature.

12. Cairns, J., Overbaugh, J. & Miller, S. (1988). “The origin of mutants.” Nature.

13. McClintock, B. (1950). “The origin and behavior of mutable loci in maize.” Proceedings of the National Academy of Sciences.

14. Pääbo, S. (2014). Neanderthal Man: In Search of Lost Genomes. Basic Books.

15. Krause, J. et al. (2007). “The derived FOXP2 variant of modern humans was shared with Neandertals.” Current Biology.

16. Valladas, H. et al. (2001). “Radiocarbon dates for the Chauvet Cave paintings.” Nature.

17. Hoffmann, D.L. et al. (2018). “Symbolic use of marine shells and mineral pigments by Iberian Neandertals 115,000 years ago.” Science Advances.