Jove
Visualize
Contact Us
JoVE
x logofacebook logolinkedin logoyoutube logo
ABOUT JoVE
OverviewLeadershipBlogJoVE Help Center
AUTHORS
Publishing ProcessEditorial BoardScope & PoliciesPeer ReviewFAQSubmit
LIBRARIANS
TestimonialsSubscriptionsAccessResourcesLibrary Advisory BoardFAQ
RESEARCH
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchive
EDUCATION
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualFaculty Resource CenterFaculty Site
Terms & Conditions of Use
Privacy Policy
Policies

Related Concept Videos

Evolution of New Traits in Microbes01:24

Evolution of New Traits in Microbes

184
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...
184
Randomized Experiments01:13

Randomized Experiments

9.4K
The randomization process involves assigning study participants randomly to experimental or control groups based on their probability of being equally assigned. Randomization is meant to eliminate selection bias and balance known and unknown confounding factors so that the control group is similar to the treatment group as much as possible. A computer program and a random number generator can be used to assign participants to groups in a way that minimizes bias.
Simple randomization
Simple...
9.4K
Evolutionary Psychology01:20

Evolutionary Psychology

1.3K
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...
1.3K
Genetic Drift03:33

Genetic Drift

45.6K
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.
45.6K
Evolutionary Processes in Microbes01:26

Evolutionary Processes in Microbes

187
Microbial evolution occurs rapidly due to short generation times and a variety of genetic processes, including horizontal gene transfer, mutation, recombination, and genetic drift. These mechanisms collectively enable microbes to adapt swiftly to changing environments.Horizontal gene transfer (HGT) allows genes to move between different species and occurs through three main mechanisms: conjugation, transformation, and transduction. Conjugation involves direct cell-to-cell contact for DNA...
187
Mutation, Gene Flow, and Genetic Drift01:09

Mutation, Gene Flow, and Genetic Drift

66.5K
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).
66.5K

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by
Same author

Epidemic spreading on hierarchical geographical networks with mobile agents.

Communications in nonlinear science & numerical simulation·2020
Same author

Empirical Studies on the Network of Social Groups: The Case of Tencent QQ.

PloS one·2015
Same author

Cascading walks model for human mobility patterns.

PloS one·2015
Same author

Emergence of blind areas in information spreading.

PloS one·2014
Same author

A model of two-way selection system for human behavior.

PloS one·2014
Same author

Correlations and scaling laws in human mobility.

PloS one·2014
Same journal

Behavioral and physiological changes during the estrous cycle of socially housed female guinea pigs.

Behavioural processes·2026
Same journal

Flexible time-series analysis: A dynamically aware method for inferring directed dependencies in behavioral data.

Behavioural processes·2026
Same journal

Effects of group size and landmarks on escape behavior of three fish species.

Behavioural processes·2026
Same journal

Vocal individuality in two sympatric seabird species: The role of developmental strategy, analytical approach and sample size.

Behavioural processes·2026
Same journal

No evidence of sex-specific responses to chemosensory risk assessment cues in Harts rivulus.

Behavioural processes·2026
Same journal

Exploratory responses of rats to cage-mates and conspecifics from another cage in a habituation-dishabituation paradigm with multiple habituation stimuli.

Behavioural processes·2026
See all related articles

Related Experiment Video

Updated: Apr 18, 2026

Daily Transfers, Archiving Populations, and Measuring Fitness in the Long-Term Evolution Experiment with Escherichia coli
15:00

Daily Transfers, Archiving Populations, and Measuring Fitness in the Long-Term Evolution Experiment with Escherichia coli

Published on: August 18, 2023

4.7K

Randomness in the evolution of cooperation.

Tarik Hadzibeganovic1, Dietrich Stauffer2, Xiao-Pu Han3

  • 1Department of Psychology, University of Graz, A-8010 Graz, Austria.

Behavioural Processes
|January 11, 2015
PubMed
Summary
This summary is machine-generated.

Random bias favoring altruists can lead to their stable dominance over ethnocentric cooperation, even when ethnocentrism is initially strong. This highlights randomness

Keywords:
Agent-based modelAltruismEvolution of cooperationRandomnessTag-based cooperation

More Related Videos

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

Following the Dynamics of Structural Variants in Experimentally Evolved Populations

Published on: February 3, 2023

1.4K
Monitoring Spatial Segregation in Surface Colonizing Microbial Populations
07:40

Monitoring Spatial Segregation in Surface Colonizing Microbial Populations

Published on: October 29, 2016

11.7K

Related Experiment Videos

Last Updated: Apr 18, 2026

Daily Transfers, Archiving Populations, and Measuring Fitness in the Long-Term Evolution Experiment with Escherichia coli
15:00

Daily Transfers, Archiving Populations, and Measuring Fitness in the Long-Term Evolution Experiment with Escherichia coli

Published on: August 18, 2023

4.7K
Following the Dynamics of Structural Variants in Experimentally Evolved Populations
04:52

Following the Dynamics of Structural Variants in Experimentally Evolved Populations

Published on: February 3, 2023

1.4K
Monitoring Spatial Segregation in Surface Colonizing Microbial Populations
07:40

Monitoring Spatial Segregation in Surface Colonizing Microbial Populations

Published on: October 29, 2016

11.7K

Area of Science:

  • Evolutionary game theory
  • Computational social science
  • Behavioral economics

Background:

  • Tag-based ethnocentric cooperation is robust but can be suppressed by competing strategies.
  • Previous research focused on the initial evolutionary stages of ethnocentrism.

Purpose of the Study:

  • To investigate if indiscriminate altruism can stably outweigh ethnocentrism.
  • To determine the long-term persistence of non-ethnocentric strategies.

Main Methods:

  • Agent-based evolutionary modeling of tag-mediated cooperation.
  • Simulations on complex network topologies with haploid genetics and asexual reproduction.
  • Incorporation of memory mechanisms and heritable phenotypic traits.

Main Results:

  • Random bias favoring altruists can lead to their permanent victory over ethnocentric strategists.
  • Increased network rewiring amplifies the density difference between altruists and ethnocentrics.
  • Larger population sizes decrease this density difference.

Conclusions:

  • Randomness plays a crucial role in promoting non-ethnocentric cooperation.
  • Non-adaptive mechanisms can initiate novel behavioral phenotypes and evolutionary pathways.
  • Memory and tags enhance the stability of altruistic strategies.