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The interplay of sex-determining genes is such that if even if you have both types of equiptment at least one of them doesn't work (is sterile). Although extremely, extremely, extremely rare, it is possible for a chimeric human to be composed of both a male and female zygote and therefore, to be born with one functional teste and a functional ovary. These are not spoilers (you learn them in the first chapter of the book): The main character, Kalliope, is born a girl by all appearances and is raised as one for the first 15 years of her life.