Nettie Maria Stephens (1861-1912) was a biologist and geneticist. In 1905 she discovered the X and Y sex chromosomes while working with beetles. Stevens was able to provide proof for Calvin Bridges' hypothesis that genes were contained in chromosomes. She did this by examining the chromosomes of the fruit flys (Drosophila). Bridges wrote a couple of papers presenting the proof. He thanked her as "Miss Stevens" without stating what her contribution was nor referring to her PhD.
NettieMaria Stevens (July 7, 1861 - May 4, 1912) was an early American geneticist.
An outstanding student, Nettie Stevens completed in two years the four-year course at Westfield Normal School (now Westfield State College) in Massachusetts.
Maria, the eldest of the children, was married to William, son of Matthew Sharp, of Maccan.
Maria, the youngest daughter of Thomas Black, was married to Marcus Tuttle, of Wallace.
Their eldest daughter, Elizabeth, was married to Stephen Fulton, of Wallace (to whom reference has already been made in the notice of his first wife who was cousin to the second wife, and a daughter of Joshua and Sarah Huestis).