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Nettie Stevens discovered XY sex chromosomes. She didn't get credit because she had two X’s.
26.07.2021 Brian Resnick
Biology
Nettie Stevens

At the turn of the 20th century, biologist Nettie Stevens was driven to solve a scientific mystery that had perplexed humanity for millennia. The mystery was so simple but daunting: Why do boys become boys and girls become girls? In her pioneering work at Bryn Mawr College, Stevens — whose birthday is today, July 2 — discovered the sex chromosomes that make the difference.

Before Stevens, we were utterly clueless about how embryos become boys or girls

Thanks to Stevens’s work — and the work that built upon it — we now know that sex is hereditary, and that dads’ sperm in particular determine the sex of offspring.

vox.com
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