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  1. Nettie Maria Stevens (July 7, 1861 – May 4, 1912) was an American geneticist who discovered sex chromosomes. In 1905, soon after the rediscovery of Mendel 's paper on genetics in 1900, she observed that male mealworms produced two kinds of sperm, one with a large chromosome and one with a small chromosome.

  2. Jul 3, 2024 · Nettie Stevens (born July 7, 1861, Cavendish, Vermont, U.S.—died May 4, 1912, Baltimore, Maryland) was an American biologist and geneticist who was one of the first scientists to find that sex is determined by a particular configuration of chromosomes.

    • The Editors of Encyclopaedia Britannica
  3. Nettie Maria Stevens grew up in America just after the Civil War. Beyond teaching, nursing, or secretarial work, little opportunity was available to women looking for a profession; most simply...

  4. Nettie Marie Stevens is shown here looking through a microscope while studying at the Stazione Zoologica in Naples, Italy, in 1909. In 1904, soon after getting her Ph.D. in biology, Stevens was awarded a grant from Carnegie Science.

  5. Jun 20, 2010 · By experimenting on germ cells, cytologist Nettie Maria Stevens collected evidence to support the connection between heredity and the sex of offspring. Stevens was able to interpret her data to conclude that chromosomes have a role in sex determination during development.

  6. May 12, 2023 · Stevens studied morphology, the study of the forms of living organisms, and cytology, the study of the structure and function of plant and animal cells. Her research focused on sex determination, how biological sex and sex characteristics are determined in organisms.

  7. Mar 31, 2016 · After her European adventure, Stevens was eager to apply her impeccable histology skills to the hot topic of chromosomes and Mendelian inheritance. Once she graduated with her PhD in 1903, she and Morgan planned a collaboration on the controversial and unresolved question of how sex is determined in the developing egg.

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