Turner’s Syndrome people have external sex organs approximating a female, and their behavior is characterized as hyper-feminine, baby care oriented, and showing very poor spatial and math skills. The Turner’s personality, free of all influence from testosterone, tends to be in direct opposition to the typical set of "Tom Boy" traits.

Turner’s Syndrome relates well to our second category of Physical Gender--that being our primary and secondary sexual characteristics. To discuss this aspect of gender we need to examine hormonal involvement, in particular testosterone. All sexual differentiation, physical, mental, and emotional are produced by hormones which may be amplified and/or specified by one’s social environment. During fetal life, the amount present, or the absence of testosterone determines our sexuality -- physically, mentally and emotionally. There are key times or periods during development when the fetus will go towards the male or the female depending on the level of testosterone. These windows of opportunity may be only open for a few days and if the needed level of testosterone is not present, a basic female orientation develops regardless of the testosterone levels before or after this critical period, and the resulting sexual imprint.

The first critical period is at conception when the presence of the SRY gene (Sex-Determining Region of the Y chromosome) will determine our physical gender. The SRY gene is normally found on the short arm of the Y chromosome, but can detach making for a XY female (the Y missing its SRY gene) or a XX male (the SRY attaching to the X).

The SRY gene causes the fetus to release TDF (Testes Determining Factor) which turns the undifferentiated gonad into testes. Once testes have formed, they release androgens such as testosterone, dihydrotestosterone, and anti-mullerian hormone.

Before the release of TDF, the developing fetus has two tiny structures, the mullerian and wolffian ducts, and two small undifferentiated gonads, neither testes nor ovaries. Without the influence of TDF and testosterone, the gonads form into ovaries and the mullerian duct forms into the female internal sex organs, the wolffian duct disappears and the external sexual tissue becomes the labia major, clitoris, labia minor and clitoral hood. With the influence of TDF, the gonads become testicles and the wolffian duct forms the male internal sex organs, the mullerian ducts dissolve and the external tissue develop into the penis, scrotum, penile sheaths and foreskin. In other words, without testosterone all fetuses develop into females. Adam springs from Eve, not Eve from Adam.

As the primary sexual differentiation proceeds towards our physical gender, sometimes deviations occur. These anomalies are sometimes called "experiments of nature." One such "experiment" is a condition termed congenital adrenal hyperplasia (CAH) when the female fetus releases a steroid hormone form her adrenal glands which resembles testosterone. The resulting child often has confusing genitals ranging from deformed female genitals to an appearance of male genitals. If the child is raised as male, following any "adjusting" surgery and given male hormones at puberty, the individual develops as a "normal" but sterile male with XX chromosomes. On the other hand, if the infant is surgically corrected to female and given female hormones, there is a 50/50 chance of lesbian expression.

Another revealing "experiment of nature" is Androgen Insensitivity Syndrome. In this case, there is normal amounts of testosterone circulating in a XY chromosome fetus, but each cell of its body is unable to react to it. This is similar to Turner’s Syndrome in that neither the mullerian or wolffian ducts mature and the external genitalia develops into an approximation of normal female genitals, but differs in that TDF stimulates the gonads into becoming functioning testicles in a XY chromosome body. The child is raised as a girl and is seen as a normal female until she fails to menstruate because she has no uterus. If enough estrogen is produced by her testes, she develops into a completely normal appearing, sterile female with XY chromosomes and internal testicles.

Now we must leave the comfortable arena of biology and development and enter the more rocky, emotional and even political arena of psychology, anthropology, and sociology. An arena where deduction, speculation and circumstantial evidence is more evident than "hard fact."

The third, forth and fifth attributes all reside in the brain and there is controversy on both a congenital vs. environmental level and on a developmental one. It is still argued by some that sexual orientation is a choice and there is no difference in the mental abilities of men and women. Others argue that the evidence, both direct and circumstantial, is becoming overwhelming that these stands are incorrect.

Because of the controversy over whether significant differences in brain structure do exist between the genders, I will confine my discussion of the "Brain Sex" attribute to some behavioral differences that have been noted between morphological male and female infants and children. At all times keep in mind that Physical Gender does NOT always indicate "Brain Sex" Gender. And, while these differences are the norm, they are not absolute. Individual children may differ.

Even a few hours after birth, significant behavioral differences are noted between morphologically normal boys and girls. Newborn girls are much more sensitive to touch and sound than their male counterparts. Several day old girls spend about twice as long looking back at an adult face than boys, and even longer if the adult is speaking. A girl can distinguish between the cries of another infant from other extraneous noises long before a boy. Even before they can understand language, girls do better at identifying the emotional context of speech.

Conversely, during the first few weeks of infant life, boys are inattentive to the presence of an adult, whether speaking to the infant or not. However, baby boys tend to show more activity and wakefulness. At the age of several months, girls can usually distinguish between the faces of strangers and people they know--boys usually do not demonstrate this ability.

As infants grow into children, the differences seem to intensify and polarize. Girls learn to speak earlier than boys and do a better job of it. Boys want to explore areas, spaces and things, girls like to talk and listen. Boys like vigorous play in a large space where girls like more sedentary games in smaller spaces. Boys like to build, take things apart, explore mechanical aspects of things and are interested in other children only for their "use" (playmates, teammates, allies, etc.). Girls see others more as individuals--and will likely exclude a person because their "not nice," and will more readily include younger children and remember each other’s names. Girls play games involving home, friendship, and emotions. Boys like rough, competitive games full of "‘zap, pow’ and villainy." Boys will measure success by active interference with other players, preferring games where winning and losing is clearly defined. In contrast, girl play involves taking turns, cooperation and indirect competition. Tag is a typical boy’s game, hopscotch is a girl’s game.