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Related Concept Videos

Criticisms of the Evolutionary Perspective01:23

Criticisms of the Evolutionary Perspective

In a study where individuals posing as strangers offered compliments and proposed casual sex to students, the responses differed significantly based on gender. Not a single woman accepted the proposal, while 70% of the men agreed. This outcome provides a useful scenario to explore through the lens of evolutionary psychology and social learning theory, highlighting the diverse perspectives on human sexual behaviors.
Evolutionary psychology provides one explanation for these findings, suggesting...
Evolution of New Traits in Microbes01:24

Evolution of New Traits in Microbes

Microorganisms evolve rapidly due to their large population sizes and short generation times, often exhibiting measurable changes within days under laboratory conditions. Natural selection acts on standing genetic variation, enabling the retention and amplification of beneficial traits that confer fitness advantages in changing environments.Adaptive Pigment Regulation in RhodobacterIn Rhodobacter, a genus of purple non-sulfur bacteria, light-harvesting pigments such as bacteriochlorophyll and...
Convergent Evolution01:54

Convergent Evolution

Evolution shapes the features of organisms over time, ensuring that they are suited for the environments in which they live. Sometimes, selection pressure leads to the rise of similar but unrelated adaptations in organisms with no recent common ancestors, a process known as convergent evolution.
Evolutionary Psychology01:20

Evolutionary Psychology

Evolutionary psychology explores the origins of human behavior and mental processes by framing them within the context of natural selection, a theory famously propounded by Charles Darwin. This field asserts that many behaviors common across human societies — ranging from instinctive fear reactions to complex social interactions — arose as evolutionary adaptations. These adaptations enhanced the survival and reproductive success of our ancestors, thereby becoming embedded in the human psyche...
What is Evolutionary History?02:35

What is Evolutionary History?

Scientists record evolutionary history by analyzing fossil, morphological, and genetic data. The fossil record documents the history of life on Earth and provides evidence for evolution. However, both fossil and living organisms offer evidence that outlines Earth’s evolutionary history.
Limits to Natural Selection01:38

Limits to Natural Selection

Organisms that are well-adapted to their environment are more likely to survive and reproduce. However, natural selection does not lead to perfectly adapted organisms. Several factors constrain natural selection.

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Following the Dynamics of Structural Variants in Experimentally Evolved Populations
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Constructive neutral evolution: exploring evolutionary theory's curious disconnect.

Arlin Stoltzfus1

  • 1Institute for Bioscience and Biotechnology Research, 9600 Gudelsky Drive, Rockville, MD 20850, USA. arlin@umd.edu

Biology Direct
|October 16, 2012
PubMed
Summary
This summary is machine-generated.

Constructive neutral evolution (CNE) proposes that evolution can lead to complexity through neutral processes. This challenges traditional views, highlighting mutation as a driver of novelty rather than just raw material.

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Area of Science:

  • Evolutionary biology
  • Genetics

Background:

  • Classical neo-Darwinian theory posits selection as the primary driver of evolutionary creativity and complexity.
  • Contemporary evolutionary genetics increasingly utilizes models where mutation plays a more active role in introducing novelty.

Purpose of the Study:

  • To explore the implications of constructive neutral evolution (CNE) on our understanding of evolutionary causation.
  • To examine the role of mutation as a source of novelty versus raw material in evolution.

Main Methods:

  • Conceptual review and theoretical discussion of evolutionary models.
  • Analysis of the mutation-selection-fixation framework in evolutionary genetics.

Main Results:

  • Constructive neutral evolution (CNE) offers a potential pathway for stepwise increases in complexity without directional selection.
  • A mutationist perspective, viewing mutation as an agent of novelty and selection as a sieve, is gaining traction in theoretical and practical applications.

Conclusions:

  • The prevailing view of evolutionary causation is shifting, with a growing emphasis on the role of mutation in generating novelty.
  • CNE provides a framework for investigating the significant implications of variation's role in evolutionary processes.