The British Journal of Psychiatry 161: 852-854 (1992)
© 1992 The Royal College of Psychiatrists
A female monozygotic twin pair discordant for transsexualism. Some theoretical implications
GM Garden and DJ Rothery
Kidderminster General Hospital, Birmingham.
A 13-year-old girl was referred because of sexual identity problems. There
was no mental illness or neurological abnormalities. As her twin sister had
no sexual identity problems, it appears that transsexualism is not
transmitted by a simple genetic mechanism.