Excess of counterclockwise scalp hair-whorl rotation in homosexual men
- Amar J. S. Klar
- … show all 1 hide
Rent the article at a discountRent now
* Final gross prices may vary according to local VAT.Get Access
While most men prefer women as their sexual partners, some are bisexual and others are homosexuals. It has been debated for a long time whether a person’s sexual preference is innate, learned, or due to a combination of both causes. It was recently discovered that the human right-versus-left-hand use preference and the direction of scalp hair-whorl rotation develop from a common genetic mechanism. Such a mechanism controls functional specialization of brain hemispheres. Whether the same mechanism specifying mental makeup influences sexual preference was determined here by comparing hair-whorl rotation in groups enriched with homosexual men with that in males at large. Only a minority of 8.2% (n = 207) unselected ‘control’ group of males had counterclockwise rotation. In contrast, all three samples enriched with homosexual men exhibited highly significant (P< 0.0001), 3.6-fold excess (29.8%,n = 272) counterclockwise rotation. These results suggest that sexual preference may be influenced in a significant proportion of homosexual men by a biological/genetic factor that also controls direction of hair-whorl rotation.
- Bailey J. M. 1989 A test of the maternal stress hypothesis for male homosexuality.Behav. Genet. 19, 744.
- Bailey J. M. and Pillard R. C. 1991 A genetic study of male sexual orientation.Arch. Gen. Psychiatry 48, 1089–1096.
- Bailey J. M., Pillard R. C., Neale M. C. and Agyei Y. 1993 Heritable factors influence sexual orientation in women.Arch. Gen. Psychiatry 50 217–223.
- Bailey J. M., Pillard R. C., Dawood K., Miller M. B., Farrer L. A., Trivedi S. and Murphy R. L. 1999 A family history study of male sexual orientation using three independent samples.Behav. Genet. 29, 79–86. CrossRef
- Banks A. and Gartrell N. K. 1995 Hormones and sexual orientation: a questionable link.J. Homosex. 28, 247–268. CrossRef
- Bocklandt S. and Hamer D. H. 2003 Beyond hormones: a novel hypothesis for the biological basis of male sexual orientation.J. Endocrinol Invest. 26, 8–12.
- Bogaert A. F. and Blanchard R. 1996 Handedness in homosexual and heterosexual men in the Kinsey interview data.Arch. Sex. Behav. 25, 373–378. CrossRef
- Geschwind D. H., Miller B. L., DeCarli C. and Carmelli D. 2002 Heritability of lobar brain volumes in twins supports genetic models of cerebral laterality and handedness.Proc. Natl. Acad. Sci. USA 99, 3176–3181. CrossRef
- Gotestam K. O., Coates T. J. and Ekstrand M. 1992 Handedness, dyslexia and twinning in homosexual men.Int. J. Neurosci. 63, 179–186.
- Hall J. C. 2002 Courtship lite: a personal history of reproductive behavioral neurogenetics in Drosophila.J. Neurogenet. 16, 135–163. CrossRef
- Halpern D. F. and Cass M. 1994 Laterality, sexual orientation, and immune system functioning: is there a relationship?Int. J. Neurosci. 77, 167–180. CrossRef
- Hamer D. H., Hu S., Magnuson V. L., Hu N. and Pattatucci A. M. 1993 A linkage between DNA markers on the X chromosome and male sexual orientation.Science 261, 321–327. CrossRef
- Holtzen D. W. 1994 Handedness and sexual orientation.J. Clin. Exp. Neuropsychol. 16, 702–712.
- Hu S., Pattatucci A. M., Patterson C., Li L., Fulker D. W., Cherny S. S., Kruglyak L. and Hamer D. H. 1995 Linkage between sexual orientation and chromosome Xq28 in males but not in females.Nat. Genet. 11, 248–256. CrossRef
- Klar A. J. 2003 Human handedness and scalp hair-whorl direction develop from a common genetic mechanism.Genetics 165, 269–276.
- Lalumiere M. L., Blanchard R. and Zucker K. J. 2000 Sexual orientation and handedness in men and women: a metaanalysis.Psychol. Bull. 126, 575–592. CrossRef
- Lippa R. A. 2003 Handedness, sexual orientation, and genderrelated personality traits in men and women.Arch. Sex. Behav. 32, 103–114. CrossRef
- McCormick C. M., Witelson S. F. and Kingstone E. 1990 Lefthandedness in homosexual men and women: neuroendocrine implications.Psychoneuroendocrinology 15, 69–76. CrossRef
- Mustanski B. S., Chivers M. L. and Bailey J. M. 2002a A critical review of recent biological research on human sexual orientation.Annu. Rev. Sex Res. 13, 89–140.
- Mustanski B. S., Bailey J. M. and Kaspar S. 2002 Dermatoglyphics, handedness, sex, and sexual orientation.Arch. Sex. Behav. 31, 113–122. CrossRef
- Pillard R. C. and Weinrich J. D. 1986 Evidence of familial nature of male homosexuality.Arch. Gen. Psychiatry 43, 808–812.
- Pollard I. 1996 Preconceptual programming and sexual orientation: a hypothesis.J. Theor. Biol. 179, 269–273. CrossRef
- Rice G., Anderson C., Risch N. and Ebers G. 1999 Male homosexuality: absence of linkage to microsatellite markers at Xq28.Science 284, 665–667. CrossRef
- Satz P., Miller E. N., Selnes O., Van Gorp W., D’Elia L. F. and Visscher B. 1991 Hand preference in homosexual men.Cortex 27, 295–306.
- Excess of counterclockwise scalp hair-whorl rotation in homosexual men
Journal of Genetics
Volume 83, Issue 3 , pp 251-255
- Cover Date
- Print ISSN
- Online ISSN
- Springer India
- Additional Links
- sexual orientation
- human behaviour
- hair-whorl orientation
- behaviour biology
- Amar J. S. Klar (1)
- Author Affiliations
- 1. Ijamsville, 21754, MD, USA