The sexual selection of larger males may be driven by an abundance – not a scarcity – of females.
Rather than distinctly male or female, the human brain is much more like the heart, kidneys and lungs – basically the same no matter the sex of the body it’s in.
It’s not about trauma or how you were raised: evidence now points to a biological basis for transgender, and to the action of particular genes in that determination.
How can the same basic genome produce such different forms in the two sexes of a single species? It turns out one gene can encode for various things, depending on the order its instructions are read.