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Related Concept Videos

The Evidence for Evolution02:55

The Evidence for Evolution

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Genetic variations accumulating within populations over generations give rise to biological evolution. Evolutionary changes can result in the formation of novel varieties and entire new species. These changes are responsible for the diverse forms of life inhabiting the planet. The evidence for evolution suggests that all living organisms descended from common ancestors.
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Evolutionary Psychology01:20

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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...
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What is Evolutionary History?02:35

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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.
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Mutation, Gene Flow, and Genetic Drift01:09

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In a population that is not at Hardy-Weinberg equilibrium, the frequency of alleles changes over time. Therefore, any deviations from the five conditions of Hardy-Weinberg equilibrium can alter the genetic variation of a given population. Conditions that change the genetic variability of a population include mutations, natural selection, non-random mating, gene flow, and genetic drift (small population size).
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Limits to Natural Selection01:38

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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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Genetic Drift03:33

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Natural selection—probably the most well-known evolutionary mechanism—increases the prevalence of traits that enhance survival and reproduction. However, evolution does not merely propagate favorable traits, nor does it always benefit populations.
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Related Experiment Video

Updated: Jun 4, 2025

Following the Dynamics of Structural Variants in Experimentally Evolved Populations
04:52

Following the Dynamics of Structural Variants in Experimentally Evolved Populations

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Evolution takes multiple paths to evolvability when facing environmental change.

Bhaskar Kumawat1, Alexander Lalejini1,2,3, Monica M Acosta1,2

  • 1Department of Ecology and Evolutionary Biology, University of Michigan, Ann Arbor, MI 48109.

Proceedings of the National Academy of Sciences of the United States of America
|December 31, 2024
PubMed
Summary
This summary is machine-generated.

Populations evolve higher mutation rates and beneficial mutations in changing environments. This dual strategy enhances adaptation to both familiar and novel conditions, improving survival.

Keywords:
digital evolutionevolvabilityfitness landscapemutation rate

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Area of Science:

  • Evolutionary biology
  • Genetics
  • Computational biology

Background:

  • Organisms rapidly adapt to new challenges like antimicrobial resistance.
  • Understanding the evolution of evolvability is crucial for human health.
  • Key questions remain about how populations gain adaptive potential.

Purpose of the Study:

  • To investigate how changing environments drive the evolution of evolvability.
  • To determine the mechanisms by which populations enhance their adaptive capacity.
  • To explore the interplay between mutation rates and mutational effects during adaptation.

Main Methods:

  • Digital evolution simulations were employed to model evolutionary processes.
  • Researchers tracked evolving lineages and their mutant phenotypes precisely.
  • Genotype and phenotype spaces were analyzed to understand adaptive landscapes.

Main Results:

  • Changing environments simultaneously selected for higher mutation rates and beneficial mutations.
  • Evolved populations showed enhanced adaptation to both past and novel environments.
  • Populations localized on phenotypic boundaries, indicating strategic adaptation.

Conclusions:

  • Evolution concurrently shapes multiple factors of evolvability.
  • This concurrent evolution optimizes adaptive responses to environmental unpredictability.
  • Findings provide insights into population survival strategies in dynamic conditions.