The X, The Y and Nettie Stevens
In the early 20th century, one of biology’s biggest mysteries was: What determines whether an organism is male or female? For centuries, this question wasn’t just scientific; it was deeply social. Across cultures, the sex of a child was often seen as the responsibility of the mother, with women praised or blamed for what was, in truth, beyond their control. At a time when answers were still speculative, a quiet yet determined scientist looked deep into the microscopic world for clarity and found it. Nettie Stevens did not just contribute to genetics; she helped dismantle a long-standing misconception. Nettie Stevens Born in 1861 in Vermont, Nettie Stevens grew up in a time when opportunities for women were limited. Though she showed early academic promise, her path into research was delayed not by lack of ability, but by circumstance. For years, she worked as a schoolteacher, saving money and supporting herself. Many would have accepted that as the final destination. But S...