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Evolution of interactions in family-structured populations: mixed mating models
1Department of Ecology and Evolutionary Biology, University of Arizona, Tucson, Arizona 85721.
Genetics
|September 1, 1980
Summary
Inbreeding generally promotes altruism by increasing relatedness within families. However, extreme altruism is hindered by inbreeding, which reduces heterozygote frequency.
Area of Science:
- Evolutionary biology
- Behavioral ecology
- Population genetics
Background:
- Inbreeding, the mating of related individuals, can significantly impact social behaviors.
- Understanding the evolutionary consequences of inbreeding on altruism is crucial for social evolution theory.
Purpose of the Study:
- To theoretically investigate the effect of inbreeding on the evolution of sibling interactions in mixed mating systems.
- To analyze how different mating systems (sib-mating with random mating, selfing with random mating) influence altruism.
Main Methods:
- Theoretical modeling of altruism under various mating systems.
- Analysis of additive and multiplicative models of gene fitness.
- Study of total altruism using a general fitness formulation.
Main Results:
- Inbreeding facilitates the evolution of altruistic genes in additive and most multiplicative models.
- Inbreeding often retards the increase of genes for extreme altruism.
- Equilibrium frequencies of certain recessive altruistic genes are independent of the mating system.
Conclusions:
- Inbreeding generally facilitates altruism by increasing within-family relatedness.
- Extreme altruism is an exception, as inbreeding reduces heterozygotes, hindering allele transmission.
- Inbreeding's primary effect is altering genotypic distributions influencing social interactions.
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