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A method yielding comparable estimates of the fraternal birth order and female fecundity effects in male homosexuality.
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- Additional Information
- Source:
Publisher: Royal Society of London Country of Publication: England NLM ID: 101245157 Publication Model: Print-Electronic Cited Medium: Internet ISSN: 1471-2954 (Electronic) Linking ISSN: 09628452 NLM ISO Abbreviation: Proc Biol Sci Subsets: MEDLINE
- Publication Information:
Original Publication: London : Royal Society of London, c1990-
- Subject Terms:
- Abstract:
The fraternal birth order effect (FBOE) is the finding that older brothers increase the probability of homosexuality in later-born males, and the female fecundity effect (FFE) is the finding that the mothers of homosexual males produce more offspring than the mothers of heterosexual males. In a recent paper, Khovanova proposed a novel method for computing independent estimates of these effects on the same samples and expressing the magnitude and direction of the effects in the same metric. In her procedure, only families with one or two sons are examined, and daughters are ignored. The present study investigated the performance of Khovanova's method using archived data from 10 studies, comprising 14 samples totalling 5390 homosexual and heterosexual subjects. The effect estimate for the FBOE showed that an increase from zero older brothers to one older brother is associated with a 38% increase in the odds of homosexuality. By contrast, the effect estimate for the FFE showed that the increase from zero younger brothers to one younger brother is not associated with any increase in the odds of homosexuality. The former result supports the maternal immune hypothesis of male homosexuality; the latter result does not support the balancing selection hypothesis.
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- Contributed Indexing:
Keywords: balancing selection; female fecundity; fraternal birth order; homosexuality; maternal immunization; older brothers
- Molecular Sequence:
figshare 10.6084/m9.figshare.c.4880376
- Publication Date:
Date Created: 20200319 Date Completed: 20200701 Latest Revision: 20240328
- Publication Date:
20240329
- Accession Number:
PMC7126035
- Accession Number:
10.1098/rspb.2019.2907
- Accession Number:
32183625
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