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Altruism01:03

Altruism

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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.
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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.
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Voluntary behavior with the intent to help other people is called prosocial behavior. Why do people help other people? Is personal benefit such as feeling good about oneself the only reason people help one another?
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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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Behavioral Genetics and Its Designs01:23

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Behavior genetics explores how genetic inheritance influences human behavior. It focuses on how genes, passed from parents to offspring, contribute to the development of behavioral traits and tendencies. This branch of genetics seeks to understand the complex interplay between inherited genetic factors and environmental influences in shaping our behaviors.
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Genome-wide Association Studies-GWAS01:11

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Genome-wide association studies or GWAS are used to identify whether common SNPs are associated with certain diseases. Suppose specific SNPs are more frequently observed in individuals with a particular disease than those without the disease. In that case, those SNPs are said to be associated with the disease. Chi-square analysis is performed to check the probability of the allele likely to be associated with the disease.
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Related Experiment Video

Updated: Oct 19, 2025

Genetic Mapping of Thermotolerance Differences Between Species of Saccharomyces Yeast via Genome-Wide Reciprocal Hemizygosity Analysis
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Altruism as an Explanation for Human Consanguinity.

Srdjan Denic1, Mukesh M Agarwal2

  • 1College of Medicine and Health Sciences, United Arab Emirates University, Al Ain, United Arab Emirates, s.denic@uaeu.ac.ae.

Public Health Genomics
|September 27, 2021
PubMed
Summary
This summary is machine-generated.

Human inbreeding persists due to limited trust beyond kin, hindering cooperation and group size. Expanding altruism to non-relatives can reduce consanguinity and increase prosperity.

Keywords:
Community geneticsHuman altruismHuman inbreedingMate selectionPublic healthSociobiological principles of behavior

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Area of Science:

  • Sociobiology
  • Anthropology
  • Population Genetics

Background:

  • Human inbreeding (consanguinity) is a persistent sociobiological puzzle despite known genetic risks.
  • Existing explanations for the prevalence of consanguinity in modern societies are inadequate.

Purpose of the Study:

  • To propose a novel sociobiological explanation for the persistence of human inbreeding.
  • To investigate the role of trust and altruism in population structure and consanguinity.

Main Methods:

  • Theoretical analysis of sociobiological principles.
  • Historical perspective linking Neolithic revolution to population structure.
  • Exploration of trust dynamics within kinship groups versus broader social networks.

Main Results:

  • The Neolithic Agrarian revolution fostered larger, more cohesive kinship groups (tribes) due to increased resource competition.
  • Trust, a form of altruism, initially limited to kin, maintained small, economically poor, and consanguineous tribal structures.
  • Expansion of trust beyond kin is linked to increased group size, economic wealth, and decreased consanguinity.

Conclusions:

  • Limited non-kin altruism contributes to poverty, small group sizes, and inbreeding.
  • The evolution of trust from kin-based to broader social networks is crucial for societal development and reduced consanguinity.
  • Understanding trust dynamics offers insights into persistent human consanguinity and societal structures.