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Female choice and variation in the major histocompatibility complex
1Department of Zoology, Arizona State University, Tempe 85287.
Genetics
|October 1, 1992
Summary
Female mice may choose mates with different immune genes (major histocompatibility complex - MHC) to increase offspring genetic diversity. This mate choice strategy can maintain gene variation and influence population genetics.
Area of Science:
- Genetics
- Evolutionary Biology
- Animal Behavior
Background:
- The high genetic variability within the major histocompatibility complex (MHC) is a well-established phenomenon.
- The evolutionary drivers maintaining this diversity, particularly in the context of mate selection, remain incompletely understood.
Purpose of the Study:
- To develop a theoretical model explaining how female mate choice can contribute to the maintenance of genetic diversity at the MHC.
- To investigate the potential consequences of MHC-based female preference on population genetic parameters.
Main Methods:
- Development of a mathematical model simulating female mate choice based on MHC genetic dissimilarity.
- Analysis of the model's predictions regarding genotype frequencies, polymorphism, and mating patterns.
Main Results:
- The model demonstrates that female preference for dissimilar MHC genotypes can significantly reduce the proportion of homozygous individuals.
- This selective mating strategy effectively promotes and maintains genetic polymorphism within the population.
- The model also indicates that female choice can influence the frequencies of specific mating types and generate gametic disequilibrium.
Conclusions:
- Female preference for MHC-dissimilar mates provides a viable mechanism for maintaining high genetic variability in this crucial immune gene region.
- This behavior has broader implications for population genetics, including the regulation of genetic diversity and the generation of non-random mating associations.