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During the change associated with century that is 20th biologist Nettie Stevens ended up being driven to fix a systematic secret which had perplexed mankind for millennia. The secret ended up being therefore easy but daunting: Why do men be girls and boys become girls? In her own pioneering work on Bryn Mawr university, Stevens — whoever birthday celebration is today, July 2 — discovered the intercourse chromosomes that produce the huge difference.
Before Stevens russian brides for marriage in india, we had been utterly clueless how embryos become males or girls
As a result of Stevens’s work — as well as the work that built upon it — we now realize that sex is hereditary, and that dads’ sperm in particular determine the intercourse of offspring.
However for nearly all of history, this concern ended up being a mystery that is absolute and it also yielded some interesting theories. …