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In 2011, researchers showed that if another key ovarian gene, RSPO1, is not working normally, it causes XX people to develop an ovotestis—a gonad with areas of both ovarian and testicular development.

In 2011, researchers showed6 that if another key ovarian gene, RSPO1, is not working normally, it causes XX people to develop an ovotestis — a gonad with areas of both ovarian and testicular development.

Sometimes, nature gets its wires crossed and the luckless infant develops one ovary and one testicle, or an intermediate type of "ovotestis." and some of the genital organs of both sexes.