Khytam Dawood on transsexualism

Khytam Dawood was a J. Michael Bailey student at Northwestern University and is now a geneticist at University of Chicago trying to replicate the "gay gene" work reported by Dean Hamer.

Dawood wrote one of the first glowing Amazon reviews for Bailey's 2003 book The Man Who Would Be Queen. This book is widely considered the most defamatory book on gender variance since Janice Raymond published The Transsexual Empire in 1979. Dawood is a member of Our Lady of Mount Carmel Church as well as the member of a n number of behavior genetics trade groups.

Dawood is also involved in the gay brothers study with Alan Sanders.


Molecular Study of Sexual Orientation.

Dawood K, Bailey JM, Loehlin J, Martin N. Are Opposite-Sex Twins Sex-Atypical? April 24, 2004

Dawood K, Kirk KM, Bailey JM, Andrews PW, Martin NG. Genetic and environmental influences on the frequency of orgasm in women. Twin Research and Human Genetics, Volume 8, Number 1, January 2005, pp. 27-33(7)

This study reports on genetic and environmental influences on the frequency of orgasm in women during sexual intercourse, during other sexual contact with a partner, and during masturbation. Participants were drawn from the Australian Twin Registry, and recruited from a large, partly longitudinal twin-family study. Three thousand and eighty women responded to the anonymous self-report questionnaire, including 667 complete monozygotic (MZ) pairs and 377 complete dizygotic (DZ) same-sex pairs, 366 women from complete DZ opposite-sex pairs, and 626 women whose co-twins did not participate. Significant twin correlations were found for both MZ and DZ twin pairs for all three items of interest. Age effects were statistically significant for some items. Models incorporating additive genetic, shared and nonshared environmental influences provided the best fit for Items 1 and 3, while a model with additive and nonadditive genetic influences along with nonshared envir-onment fitted the data from Item 2. While an independent pathway model fits the data most par-simoniously, a common pathway model incorporating additive genetic (A), shared environment (C), and unique environment (E) effects cannot be ruled out. Overall, genetic influences account for approximately 31% of the variance of frequency of orgasm during sexual intercourse, 37% of the variance of frequency of orgasm during sexual contact other than during intercourse, and 51% of the variance of frequency of orgasm during masturbation. Following Baker (1996), we speculate that this additive genetic variance might arise from frequency-dependent selection for a variety of female sexual strategies.

Dawood K, Pillard RC, Horvath C, Revelle W, Bailey JM. Familial Aspects of Male Homosexuality. Archives of Sexual Behavior 04/2000 29 (2): 155-163

Research has generally supported the existence of familial-genetic factors for male sexual orientation, but has not shed much light on the specific nature of those influences. Gay men with gay brothers provide the opportunity to examine several hypotheses. Sixty-six men, representing 37 gay male sibling pairs, completed questionnaires assessing behavior on various measures including childhood and adult gender nonconformity, timing of awareness of homosexual feelings, self-acceptance, and the quality of family relationships. Consistent with prior findings using twins, gay brothers were similar in their degree of childhood gender nonconformity, suggesting that this variable may distinguish etiologically (e.g., genetically) heterogeneous subtypes. The large majority of gay men with brothers knew about their own homosexual feelings before they learned about their brothers’ homosexual feelings, suggesting that discovery of brothers’ homosexuality is not an important cause of male homosexuality.

Bailey JM, Pillard RC, Dawood K, Miller MB, Farrer LA, Trivedi S, Murphy RL. A family history study of male sexual orientation using three independent samples. Behav Genet. 1999 Mar;29(2):79-86.

Available evidence suggests that male homosexuality is both familial and somewhat heritable and that some cases may be caused by an X-linked gene. However, most studies have recruited subjects in a relatively unsystematic manner, typically via advertisements, and hence suffer from the potential methodological flaw of ascertainment bias due to volunteer self-selection. In the present study we assessed the familiality of male homosexuality using two carefully ascertained samples and attempted to replicate findings consistent with X-linkage in three samples. The percentage of siblings of the probands rated as either homosexual or bisexual, with a high degree of certainty, ranged from 7 to 10% for brothers and 3 to 4% for sisters. These estimates are higher than recent comparable population-based estimates of homosexuality, supporting the importance of familial factors for male homosexuality. Estimates of lambda s for male homosexuality ranged from 3.0 to 4.0. None of the samples showed a significantly greater proportion of maternal than paternal homosexual uncles or homosexual male maternal first cousins. Although our results differed significantly with those of some prior studies, they do not exclude the possibility of moderate X-linkage for male sexual orientation.

Research Participants Sought for Sexual Orientation Study. [PDF] NOGLSTP Bulletin, Fall 2000.

University of Chicago researchers Khytam Dawood and Alan Sanders seek assistance in a research study entitled “Molecular Genetic Study of Sexual Orientation”. The study seeks to recruit approximately 500 pairs of homosexual brothers and available parents in order to perform a linkage study to better understand the genetic contributions to this trait. A sample size of 500 brother pairs will allow the study to clear up some of the statistical uncertainty in this field of inquiry in previous work (~50 or fewer pairs of brothers each, and only examining the X chromosome, i.e., Dean Hamer's work and others). For further information, contact
Alan Sanders, M.D., University of Chicago,
phone: 773 834-3502,

Lacy M. Clinical Psychology Internship Program. University if Chicago Department of Psychiatry. 14 September 2005

Khytam Dawood, Ph.D. is a licensed clinical psychologist who specializes in human behavior genetics research. Her work is primarily focused on investigating the genetics and development of human sexual orientation. A related area of clinical and research interest is in child and adolescent gender nonconformity, and gender identity disorder.

Child/Adolescent Gender Identity Service. This rotation includes clinical experience with both children and adolescent populations. Interns will also receive training in providing comprehensive psychological evaluation for gender identity problems in children and adolescents where there is concern about a child’s gender identity development, or an adolescent who is struggling with sexual orientation. A support group for parents will also be offered. The rotation requires participation in weekly group supervision and a weekly clinical/research seminar, and guided practice in cognitive-behavioral case formulation. (Director: Khytam Dawood)