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

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

During the change associated with century that is 20th biologist Nettie Stevens ended up being driven to fix a clinical secret which had perplexed mankind for millennia. The secret ended up being therefore simple but daunting: Why do men be girls and boys become girls? Inside her pioneering work on Bryn Mawr university, Stevens — whoever birthday celebration is today, July 2 — found the intercourse chromosomes that produce the real difference.

Before Stevens, we had been utterly clueless on how embryos become men or girls

By way of Stevens’s work — as well as the work that built we now know that sex is hereditary, and that dads’ sperm in particular determine the sex of offspring upon it. Continue reading