Testing Miller's theory of alleles preventing androgenization as an evolutionary explanation for the genetic predisposition for male homosexuality

A1 Originalartikel i en vetenskaplig tidskrift (referentgranskad)


Interna författare/redaktörer


Publikationens författare: Santtila P, Högbacka A-L, Jern P, Johansson A, Varjonen M, Witting K, von der Pahlen B, Sandnabba NK
Förläggare: ELSEVIER SCIENCE INC
Publiceringsår: 2009
Tidskrift: Evolution and Human Behavior
Tidskriftsakronym: EVOL HUM BEHAV
Volym: 30
Nummer: 1
Artikelns första sida, sidnummer: 58
Artikelns sista sida, sidnummer: 65
Antal sidor: 8
ISSN: 1090-5138


Abstrakt

The genetic background of male homosexuality presents an evolutionary paradox, since homosexuality could be considered a reproductive disadvantage. We tested E.M. Miller's (2000) balanced polymorphism explanation, which states that alleles partially preventing androgenization in male fetuses during pregnancy would be associated with a homosexual orientation. Having all the alleles produces homosexuality, while heterosexual carriers with only a few of these alleles instead have a reproductive advantage; that is, they have more traits, which, by controlling for excessive aggressiveness and psychopathy, make them more attractive mates. Pairs of brothers were used to test these assumptions. If homosexuality is due to having all the androgenization-preventing alleles, then heterosexual men with homosexual brothers are more likely to also have some of the these alleles compared to heterosexual men with heterosexual brothers. These two categories were compared on variables related both directly and indirectly to reproductive success, with heterosexual men with a homosexual brother hypothesized to have an advantage on the variables. However, no statistically significant findings in support of the theory were detected. The results were discussed together with alternative explanations. (C) 2009 Elsevier Inc. All rights reserved.


Nyckelord

Balanced polymorphism, Evolution, Homosexuality, Reproductive advantage

Senast uppdaterad 2019-16-09 vid 08:10