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Related Concept Videos

Competition02:34

Competition

When organisms require the same limited resources within an environment, they may have to compete for them. Competition is a net-negative interaction. Even if two competing individuals or populations do not interact directly, the overall fitness of both competitors is lowered as a result of not having full access to the limited resource.
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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.
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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...
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Gene Flow

Gene flow is the transfer of genes among populations, resulting from either the dispersal of gametes or from the migration of individuals.
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Mutation, Gene Flow, and Genetic Drift

In a population that is not at Hardy-Weinberg equilibrium, the frequency of alleles changes over time. Therefore, any deviations from the five conditions of Hardy-Weinberg equilibrium can alter the genetic variation of a given population. Conditions that change the genetic variability of a population include mutations, natural selection, non-random mating, gene flow, and genetic drift (small population size).
Conservation of Small Populations02:04

Conservation of Small Populations

Small population sizes put a species at extreme risk of extinction due to a lack of variation, and a consequent decrease in adaptability. This weakens the chances of survival under pressures such as climate change, competition from other species, or new diseases. Large populations are more likely to survive pressures such as these, as such populations are more likely to harbor individuals that have genetic variants that are adaptive under new stresses. Small populations are much less likely to...

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Related Experiment Video

Updated: May 26, 2026

Assessing Differences in Sperm Competitive Ability in Drosophila
09:34

Assessing Differences in Sperm Competitive Ability in Drosophila

Published on: August 22, 2013

Does genetic diversity reduce sibling competition?

J David Aguirre1, Dustin J Marshall

  • 1School of Biological Sciences, The University of Queensland, Brisbane, 4072, Australia. d.aguirre@uq.edu.au

Evolution; International Journal of Organic Evolution
|January 7, 2012
PubMed
Summary
This summary is machine-generated.

Increased genetic diversity from mating with multiple males boosts offspring performance. This genetic variation among siblings can reduce competition and enhance fitness within a single generation.

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Area of Science:

  • Evolutionary Biology
  • Genetics
  • Reproductive Biology

Background:

  • The benefits of sexual reproduction, particularly genetic recombination, are hypothesized to increase offspring performance.
  • Multiple mating in females is known to enhance offspring performance, but often attributed to sexual selection rather than genetic diversity benefits.

Purpose of the Study:

  • To investigate the direct fitness benefits of genetic diversity on offspring performance, independent of sexual selection and maternal effects.
  • To determine if increased genetic variation within a clutch, achieved through polyandry, provides indirect fitness benefits to females.

Main Methods:

  • A controlled breeding design was employed using the solitary ascidian Ciona intestinalis.
  • Populations of full-siblings, half-siblings, and unrelated individuals were generated to vary genetic diversity.
  • Offspring performance was assessed through metamorphic success, postmetamorphic survival, and size, while controlling for maternal effects and sexual selection.

Main Results:

  • Individuals from populations with higher genetic diversity exhibited significantly greater performance across all measured metrics.
  • Increased genetic variation within a clutch, resulting from female multiple mating, led to indirect fitness benefits for females.
  • Genetic diversity among interacting siblings reduced competition for resources, enhancing fitness within a single generation.

Conclusions:

  • Genetic diversity, independent of sexual selection, directly enhances offspring performance and fitness.
  • Polyandry provides indirect fitness benefits to females by increasing genetic variation within their offspring.
  • In scenarios where siblings interact, genetic diversity is a crucial factor for improving fitness by mitigating resource competition.