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Related Concept Videos

Altruism01:03

Altruism

Altruistic behaviors are “unselfish” behaviors—those that help another individual at the expense of the individual carrying out the behavior. Despite the negative consequences for the altruistic animal, these behaviors are thought to have evolved for several reasons.
Inclusive Fitness00:57

Inclusive Fitness

Most altruistic behavior—in which one animal helps another at a cost to themselves—occurs between relatives. Scientists think these altruistic behaviors evolved because they increase the inclusive fitness of the animal providing help.
Eukaryotic Evolution01:24

Eukaryotic Evolution

The endosymbiont theory is the most widely accepted theory of eukaryotic evolution; however, its progression is still somewhat debated. According to the nucleus-first hypothesis, the ancestral prokaryote first evolved a membrane to enclose DNA and form the nucleus. Conversely, the mitochondria-first hypothesis suggests that the nucleus was formed after endosymbiosis of mitochondria.
Contrary to the endosymbiont theory, the eukaryote-first hypothesis proposes that the simpler prokaryotic and...
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...
Relationship with Other Adult Family Members and Siblings01:29

Relationship with Other Adult Family Members and Siblings

Other adult family members and siblings play a crucial role in shaping children’s social and emotional development. While parents or primary caregivers are often the central figures in early attachment and socialization, other adults in a child’s life, such as grandparents, aunts, and uncles, can significantly influence developmental outcomes. These influences depend on each adult’s personality and may help compensate when a primary caregiver is emotionally distant or inconsistent. For...
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: May 12, 2026

Rearing and Double-stranded RNA-mediated Gene Knockdown in the Hide Beetle, Dermestes maculatus
09:57

Rearing and Double-stranded RNA-mediated Gene Knockdown in the Hide Beetle, Dermestes maculatus

Published on: December 28, 2016

Only full-sibling families evolved eusociality.

Jacobus J Boomsma, Madeleine Beekman, Charlie K Cornwallis

    Nature
    |March 25, 2011
    PubMed
    Summary

    This critique argues that Nowak et al.’s paper on the evolution of eusociality is irrelevant. It overlooks key empirical observations about relatedness in families, which are crucial for understanding eusociality.

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    Area of Science:

    • Evolutionary Biology
    • Sociobiology
    • Behavioral Ecology

    Background:

    • The paper by Nowak et al. addresses the evolution of eusociality.
    • It critiques inclusive fitness theory and proposes an alternative modeling approach.
    • The authors claim their approach is more fundamental and general.

    Discussion:

    • This critique contends that Nowak et al.'s model lacks practical biological meaning for eusociality.
    • The authors' approach overlooks the crucial empirical observation that eusociality arises in clades with high relatedness between offspring and full-sibling offspring.
    • This high relatedness is independent of population structure or ploidy.

    Key Insights:

    • Inclusive fitness theory remains a valid framework for studying the evolution of eusociality.
    • Empirical observations of high relatedness within families are critical for understanding the evolution of eusociality.
    • The modeling approach proposed by Nowak et al. is deemed irrelevant for this specific biological question.

    Outlook:

    • Further research should focus on integrating empirical data on relatedness into evolutionary models of eusociality.
    • Revisiting and validating inclusive fitness theory in the context of eusociality is essential.
    • Future studies should emphasize biologically meaningful parameters for understanding the evolution of complex social systems.