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Related Concept Videos

Aggression01:47

Aggression

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Humans engage in aggression when they seek to cause harm or pain to another person. Aggression takes two forms depending on one’s motives: hostile or instrumental. Hostile aggression is motivated by feelings of anger with intent to cause pain; a fight in a bar with a stranger is an example of hostile aggression. In contrast, instrumental aggression is motivated by achieving a goal and does not necessarily involve intent to cause pain (Berkowitz, 1993); a contract killer who murders for...
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The Evidence for Evolution02:55

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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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Convergent Evolution01:54

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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.
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Eukaryotic Evolution01:24

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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...
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Synteny and Evolution02:31

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John H. Renwick first coined the term “synteny” in 1971, which refers to the genes present on the same chromosomes, even if they are not genetically linked. The species with common ancestry tend to show conserved syntenic regions. Therefore, the concept of synteny is nowadays used to describe the evolutionary relationship between species.
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Genome Size and the Evolution of New Genes03:21

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While every living organism has a genome of some kind (be it RNA, or DNA), there is considerable variation in the sizes of these blueprints. One major factor that impacts genome size is whether the organism is prokaryotic or eukaryotic. In prokaryotes, the genome contains little to no non-coding sequence, such that genes are tightly clustered in groups or operons sequentially along the chromosome. Conversely, the genes in eukaryotes are punctuated by long stretches of non-coding sequence.
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Related Experiment Video

Updated: Feb 16, 2026

Studying Aggression in Drosophila fruit flies
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Two types of aggression in human evolution.

Richard W Wrangham1

  • 1Department of Human Evolutionary Biology, Harvard University, Cambridge, MA 02138 wrangham@fas.harvard.edu.

Proceedings of the National Academy of Sciences of the United States of America
|December 28, 2017
PubMed
Summary
This summary is machine-generated.

Human aggression comprises two types: proactive and reactive. Understanding this distinction clarifies human nature and evolution, resolving long-standing debates and paradoxes.

Keywords:
capital punishmenthuman evolutionproactive aggressionreactive aggressionself-domestication

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Area of Science:

  • Behavioral science
  • Evolutionary psychology
  • Neuroscience

Background:

  • Human aggression is complex, with two distinct forms: proactive and reactive.
  • These aggression types differ in eliciting factors, neural pathways, development, and function.
  • Previous research has debated the significance of aggression in human nature.

Purpose of the Study:

  • To differentiate between proactive and reactive aggression in humans.
  • To investigate the evolutionary and functional significance of these aggression types.
  • To resolve debates concerning human aggression and the execution paradox.

Main Methods:

  • Comparative analysis of human aggression with primate models (chimpanzees, bonobos).
  • Examination of the role of proactive and reactive aggression in human evolution and social behavior.
  • Theoretical analysis to address the execution paradox.

Main Results:

  • Humans exhibit a high propensity for proactive aggression, similar to chimpanzees.
  • Humans display a low propensity for reactive aggression, more akin to bonobos.
  • The bimodal classification of aggression resolves debates on human nature and the execution paradox.

Conclusions:

  • The proactive-reactive aggression dichotomy provides a framework for understanding human aggression.
  • This framework reconciles seemingly contradictory views on human aggression's role.
  • Further research into the biology of proactive aggression is warranted.