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Nettie Stevens discovered XY intercourse chromosomes. She did not get credit because she had two X’s.

In the turn associated with the century that is 20th biologist Nettie Stevens was driven to resolve a systematic secret which had perplexed mankind for millennia. The mystery ended up being therefore easy but daunting: Why do males be girls and boys become girls? Inside her pioneering just work at Bryn Mawr university, Stevens — whoever birthday celebration is today, July 2 — found the intercourse chromosomes that produce the huge difference. Before Stevens, we had been utterly clueless on how...

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