Crusaders, monks and family fortunes: evolutionary models of male homosexuality and related phenomena
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11210%2F25%3A10498927" target="_blank" >RIV/00216208:11210/25:10498927 - isvavai.cz</a>
Alternative codes found
RIV/00216208:11310/25:10498927 RIV/00216208:11620/25:10498927
Result on the web
<a href="https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=6my-0llp5R" target="_blank" >https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=6my-0llp5R</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1098/rspb.2024.2756" target="_blank" >10.1098/rspb.2024.2756</a>
Alternative languages
Result language
angličtina
Original language name
Crusaders, monks and family fortunes: evolutionary models of male homosexuality and related phenomena
Original language description
The fraternal birth order effect (FBOE) is a well documented preponderance of older brothers among gay men. Until now, it has lacked a proper formal treatment in light of evolutionary theory. In this article, we propose two related mathematical models based on the rigorous application of the inclusive fitness concept. The models examine sibling rivalry and resource allocation within families. One of the models assumes that the laterborn's reproductive ability is not compromised by the manipulation that leads to the exclusive allocation of family resources to the firstborn. The other model posits that this manipulation may lower the laterborn's direct fitness to zero. Both models suggest that the FBOE arises primarily from the older brother's manipulation, as the firstborn's inclusive fitness may increase, while the mother's decreases, but not vice versa. However, under certain conditions, the mother should support an activity that discourages division of family resources, and in extreme cases, the younger brother's homosexuality may be the best available reproductive strategy for his genes. The models also provide insight into the cultural evolution of primogeniture and explain how manipulation between relatives could evolve before the emergence of substantial economic inequality.
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10602 - Biology (theoretical, mathematical, thermal, cryobiology, biological rhythm), Evolutionary biology
Result continuities
Project
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Continuities
S - Specificky vyzkum na vysokych skolach<br>I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace
Others
Publication year
2025
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Proceedings of the Royal Society B: Biological Sciences
ISSN
0962-8452
e-ISSN
1471-2954
Volume of the periodical
292
Issue of the periodical within the volume
2042
Country of publishing house
GB - UNITED KINGDOM
Number of pages
12
Pages from-to
20242756
UT code for WoS article
001436887000001
EID of the result in the Scopus database
2-s2.0-86000307157