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Related Concept Videos

Frequency-dependent Selection01:21

Frequency-dependent Selection

When the fitness of a trait is influenced by how common it is (i.e., its frequency) relative to different traits within a population, this is referred to as frequency-dependent selection. Frequency-dependent selection may occur between species or within a single species. This type of selection can either be positive—with more common phenotypes having higher fitness—or negative, with rarer phenotypes conferring increased fitness.Positive Frequency-Dependent SelectionIn positive...
Types of Selection01:46

Types of Selection

Natural selection influences the frequencies of particular alleles and phenotypes within populations in several different ways. Primarily, natural selection can be directional, stabilizing, or disruptive. Directional selection favors one extreme trait and shifts the population towards that phenotype while selecting against individuals displaying alternate traits. Stabilizing selection favors an intermediate trait with a narrow range of variation. Deviation from the optimal phenotype towards an...
Short-distance Transport of Resources02:12

Short-distance Transport of Resources

Short-distance transport refers to transport that occurs over a distance of just 2-3 cells, crossing the plasma membrane in the process. Small uncharged molecules, such as oxygen, carbon dioxide, and water, can diffuse across the plasma membrane on their own. In contrast, ions and larger molecules require the assistance of transport proteins due to their charge or size. Transport across membranes also occurs within individual cells, playing a variety of essential roles for the plant as a whole.
Protein Networks02:26

Protein Networks

An organism can have thousands of different proteins, and these proteins must cooperate to ensure the health of an organism. Proteins bind to other proteins and form complexes to carry out their functions. Many proteins interact with multiple other proteins creating a complex network of protein interactions.
These interactions can be represented through maps depicting protein-protein interaction networks, represented as nodes and edges. Nodes are circles that are representative of a protein,...
Capillary Exchange01:28

Capillary Exchange

The cardiovascular system's chief role is to disseminate gases, nutrients, waste, and other substances to the body's cells. Small molecules like gases, lipids, and lipid-soluble substances directly diffuse through capillary wall endothelial cell membranes. Glucose, amino acids, and ions, including sodium, potassium, calcium, and chloride, use transporters for facilitated diffusion via membrane-specific channels. Glucose, ions, and bigger molecules may also pass through intercellular clefts.
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...

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Related Experiment Video

Updated: Jun 19, 2026

Large Scale Energy Efficient Sensor Network Routing Using a Quantum Processor Unit
05:30

Large Scale Energy Efficient Sensor Network Routing Using a Quantum Processor Unit

Published on: September 8, 2023

Selection in ephemeral networks.

Peter Godfrey-Smith1, Benjamin Kerr

  • 1Department of Philosophy, Harvard University, Cambridge, Massachusetts 02138, USA.

The American Naturalist
|October 22, 2009
PubMed
Summary
This summary is machine-generated.

This study introduces a flexible population model applicable to various biological systems, explaining the evolution of altruism. It demonstrates how nonrandom interactions and nonlinear fitness can lead to stable altruistic and selfish behaviors.

Related Experiment Videos

Last Updated: Jun 19, 2026

Large Scale Energy Efficient Sensor Network Routing Using a Quantum Processor Unit
05:30

Large Scale Energy Efficient Sensor Network Routing Using a Quantum Processor Unit

Published on: September 8, 2023

Area of Science:

  • Evolutionary biology
  • Population dynamics
  • Theoretical ecology

Background:

  • Understanding population structure is crucial for studying the evolution of social behaviors.
  • Existing models often focus on discrete groups, limiting applicability to broader biological networks.

Purpose of the Study:

  • To present a generalized model of "ephemeral" population structure.
  • To explore the evolution of altruistic behaviors within this framework.
  • To identify conditions favoring altruism and selfishness.

Main Methods:

  • Development of a mathematical model for population structure.
  • Incorporation of nonrandom interaction patterns.
  • Modeling of nonlinear fitness functions.

Main Results:

  • The model accommodates both discrete groups and continuous networks.
  • Stable polymorphisms of altruistic and selfish types can emerge.
  • Bistability in population dynamics is observed under specific conditions.

Conclusions:

  • The "ephemeral" population model offers a unified approach to studying social evolution.
  • Nonrandom interactions and nonlinear fitness are key drivers of altruism evolution.
  • The model has broad empirical relevance across diverse taxa, including microbes and plants.