Mother Nature Made Us Different
I believe that whole-life sex hormone exposure is the primary cause of all variations in sex, gender, and sexuality in the human population. This means that gender variation is natural and biological but not primarily or directly genetic. The sex hormones that our bodies produce are influenced by genetic factors, but the sex hormones that determine fetal development and mature growth often come from external sources.
It’s also true that people learn to perform their gender expressions to some extent, but I don’t believe that learned behavior is the primary cause of gender variation.
Brain Gender Identity by Dr. Sidney Ecker
I was fortunate to see a presentation on Brain Gender Identity by Dr. Sidney W. Ecker, M.D., F.A.C.S.
Dr. Ecker believes that all gender-variant behavior is all part of a single transgender continuum.
The exact mechanism by which we become transgendered has yet to be found. Perhaps it is a genetic combination, perhaps epigenetics, maybe both. Reasearch IS being conducted.
http://aebrain.blogspot.com/2009/05/...tation-by.html