Edmund Beecher Wilson
Edmund Beecher Wilson (October 19, 1856 – March 3, 1939) was a pioneering American zoologist and geneticist. He wrote one of the most influential textbooks in modern biology, ''The Cell''. He discovered the chromosomal XY sex-determination system in 1905. Nettie Stevens independently made the same discovery the same year and published shortly thereafter. Provided by Wikipedia
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