Boys tend to have more androgens (male sex hormones) than girls.
However, some boys and girls are born with a condition called congenital adrenal hyperplasia (CAH), which causes them to have significantly higher levels of androgens than their non-affected peers.
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However, girls with high androgen levels tend to display more gender-stereotypic male traits and behaviors than do than their same-age hormonally-normal peers.
Social and Environmental Factors Influencing Gender Identity Other studies have shown that children's upbringing and social environments also impacts their developing gender identities.Note that the definition of "gender" being used here (and in most TV Tropes trope names) refers to both a character's and their gender identity with the female version of the character almost always being more extensively gender-coded than the male version. Finally, in accordance with the aforementioned Laws, as well as certain demographic reasons, male-to-female changes are more likely than female-to-male ones, and the rare female-to-male ones are usually less susceptible to the Three Laws of Gender Bending.Truth in Television to some degree, as the ratio of real life trans women to trans men is roughly 3:1, but the ratio in fiction is still a much higher number.Male-to-female transformations tend to vastly outnumber the opposite when this trope is in play. It might be Played for Laughs, Played for Drama, or even played for horror if Loss of Identity or an unusual amount of Squick is involved.For Laws related to this trope, see the First Law of Gender-Bending, the Second Law of Gender Bending, and the Third Law of Gender Bending.Not to mention all the possibilities of using Gender Bender stories as metaphors for transgender identity...).Also contrast with Easy Sex Change, which deals with idealized but realistic takes on the Transgender experience. If the character belongs to a species that does this as regular thing, see Sex Shifter.Females possess two "X" chromosomes, while males possesses a single "X" chromosome and a "Y" chromosome.Even after girls with CAH have surgeries to make their genitalia look more characteristically female, they continue to show heightened masculine traits.Scientists have studied children with CAH in order to understand how their extra androgen levels affect behavior.Boys with excess androgens play and behave much like normal male peers.A character has undergone a complete physical sex change, usually through magic or Applied Phlebotinum.Depending on the medium, genre, and storyline, this may be a one-time temporary change, a recurring change (causing the character to jump the gender line often), or even permanent.For instance, they prefer to play with male peers; tend to choose traditionally masculine toys and activities (e.g., blocks, cars, models, sports) over more "feminine" toys and games; and are physically active and aggressive.