An award-winning biologist and writer applies queer feminist theory to developmental genetics, arguing that individuals are not essentially male or female.     The idea that gender is a performance—a tenet of queer feminist theory since the nineties—has spread from college classrooms to popular culture. This transformative concept has sparked reappraisals of social expectations as well as debate over not just gender, but sex: what it is, what it means, and how we know it. Most scientific and biomedical research over the past seventy years has assumed and reinforced a binary concept of...