The intersex movement in the past two decades has challenged social, medical, and academic conceptions of sex and gender. In the same period, genetic studies of sex determination, largely derived from research on intersex conditions, has revolutionized long-standing theories of sex determination. This current molecular genetics research is upending ancient sexist prejudices in biology. It also elucidates the dizzying complexity of biological sex that is well beyond simplistic sex binarism and involves multiple interactions between genes and environment.

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