Paul Schmid-Hempel
- Published in print:
- 2021
- Published Online:
- September 2021
- ISBN:
- 9780198832140
- eISBN:
- 9780191870873
- Item type:
- chapter
- Publisher:
- Oxford University Press
- DOI:
- 10.1093/oso/9780198832140.003.0006
- Subject:
- Biology, Disease Ecology / Epidemiology, Evolutionary Biology / Genetics
The sexes (male, female) differ in parasite load and immune defences. In general, males are more frequently infected and often have lower defences. The differences are one consequence of sexual ...
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The sexes (male, female) differ in parasite load and immune defences. In general, males are more frequently infected and often have lower defences. The differences are one consequence of sexual selection, where females invest more in maintenance. Females can choose males based on signs (e.g. ornaments) of higher resistance to parasites. Several theoretical scenarios can explain part of this variation. Advantages also result from genetic heterozygosity. Sex-specific hormones affect immune defences in many ways.Less
The sexes (male, female) differ in parasite load and immune defences. In general, males are more frequently infected and often have lower defences. The differences are one consequence of sexual selection, where females invest more in maintenance. Females can choose males based on signs (e.g. ornaments) of higher resistance to parasites. Several theoretical scenarios can explain part of this variation. Advantages also result from genetic heterozygosity. Sex-specific hormones affect immune defences in many ways.
Geoffrey E. Hill
- Published in print:
- 2019
- Published Online:
- June 2019
- ISBN:
- 9780198818250
- eISBN:
- 9780191859465
- Item type:
- chapter
- Publisher:
- Oxford University Press
- DOI:
- 10.1093/oso/9780198818250.003.0008
- Subject:
- Biology, Ecology, Evolutionary Biology / Genetics
At each new generation, sexual reproduction creates new combinations of nuclear and mitochondrial genes, and the potential arises for mitonuclear incompatibilities and reduced fitness. Sexual ...
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At each new generation, sexual reproduction creates new combinations of nuclear and mitochondrial genes, and the potential arises for mitonuclear incompatibilities and reduced fitness. Sexual selection plays a key role in maintaining mitonuclear coadaptation across generations because it enables pre-zygotic sorting for coadapted mitonuclear genotypes. In this chapter, I present data that individuals engaged in mate choice select partners with correct species-typical mitochondrial and nuclear genotypes as well as individuals with highly functional cellular respiration. The implication is that mate choice for compatible nuclear and mitochondrial genes can play a significant role in generating the patterns of ornamentation and preferences observed in animals.Less
At each new generation, sexual reproduction creates new combinations of nuclear and mitochondrial genes, and the potential arises for mitonuclear incompatibilities and reduced fitness. Sexual selection plays a key role in maintaining mitonuclear coadaptation across generations because it enables pre-zygotic sorting for coadapted mitonuclear genotypes. In this chapter, I present data that individuals engaged in mate choice select partners with correct species-typical mitochondrial and nuclear genotypes as well as individuals with highly functional cellular respiration. The implication is that mate choice for compatible nuclear and mitochondrial genes can play a significant role in generating the patterns of ornamentation and preferences observed in animals.
