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Related Concept Videos

Natural Selection and Mating Preferences01:06

Natural Selection and Mating Preferences

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The principle of natural selection posits that organisms better adapted to their environment are more likely to survive and reproduce. This principle is closely intertwined with mating preferences, a key aspect of sexual selection, which evolutionary psychologists believe is driven by instincts to propagate one's genes. Such instincts significantly influence mating behaviors and preferences between genders.
Females, due to their biological roles in conception, pregnancy, and nursing,...
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Types of Selection01:46

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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...
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Inclusive Fitness00:57

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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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Life Histories01:29

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Overview
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Lethal Alleles02:41

Lethal Alleles

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Agouti: A Lethal Allele
Lucien Cuénot discovered lethal alleles in 1905 while studying the inheritance of coat color in mice. The agouti gene is responsible for the color of the coat in mice. This gene codes for an agouti-signaling protein, which is responsible for melanin distribution in mammals. The wild-type allele gives rise to gray-brown coat color in mice, while the mutant allele gives rise to yellow coat color. In addition to coat color, the agouti gene is associated with the yellow...
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Frequency-dependent Selection01:21

Frequency-dependent Selection

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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.
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Related Experiment Video

Updated: May 27, 2025

Predicting the Effectiveness of Population Replacement Strategy Using Mathematical Modeling
20:36

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Juvenile mortality and sibling replacement: a kin selection approach.

Stefano Giaimo1, Arne Traulsen1

  • 1Department of Theoretical Biology, Max Planck Institute for Evolutionary Biology, Plön, Germany.

Evolution Letters
|February 17, 2025
PubMed
Summary

Sibling replacement, where offspring sacrifice themselves for kin, can explain early juvenile mortality. This kin selection model suggests it benefits future siblings and parental investment, particularly in mammals.

Keywords:
agealtruismdemographyjuvenile mortalitymammalsparental caresibling replacement

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Area of Science:

  • Evolutionary biology
  • Behavioral ecology
  • Demography

Background:

  • Offspring mortality typically decreases after birth through juvenile stages.
  • Parental investment strategies influence offspring survival and development.
  • Sibling interactions can impact individual fitness and population dynamics.

Purpose of the Study:

  • To propose and analyze a kin selection model for sibling replacement.
  • To investigate the role of sibling replacement in early juvenile mortality.
  • To explore the evolutionary incentives for altruistic behavior among siblings.

Main Methods:

  • Development of a theoretical kin selection model.
  • Mathematical analysis of the model's predictions.
  • Application of the model to demographic data from mammalian species.

Main Results:

  • Sibling replacement can create a selective pressure for increased early juvenile mortality.
  • This phenomenon is linked to positive selection for juvenile altruism within families.
  • The model explains mortality patterns beyond simple parental resource allocation.

Conclusions:

  • Sibling replacement is a viable evolutionary explanation for early-life mortality patterns.
  • Kin selection provides a framework for understanding altruistic sacrifices among siblings.
  • The ratio of altruistic actors to recipients influences the evolution of sibling replacement.