NEttie stevens By Djoulene Jul 7, 1861 Steven's Birth 1900 study of genetic inheritance She helped in the study of genetic inheritance with Thomas Morgan 1900 Bachelor and master degree in biology 1903 publication of “Further Studies on the Ciliate Infusoria,Licnophora and Boveria” 1905 She discovered that sex is based on chromosomes Apr 5, 1912 Steven's death