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Jantina " Tine" Tammes (; 23 June 1871 – 20 September 1947) was a Dutch botanist and geneticist and the first professor of genetics in the Netherlands.
After graduating from the high school for girls in Groningen and taking private lessons in mathematics, physics and chemistry, she enrolled at the University of Groningen in 1890 as one of just eleven female students. She was allowed to attend lectures but not to take any examinations, although she was awarded a teaching diploma.
Over the next decade Tammes published several influential works. In Die Periodicität morphologischer Erscheinungen bei den Pflanzen (The frequency of morphological phenomena in plants) she was one of the first Dutch scientists to report on variability, evolution and genetics. Then in 1907 she published Der Flachsstengel: Eine statistisch-anatomische Monographie (The Flax Stem: A statistical anatomical monograph) which used statistics and probability theory to shed light on the inheritance of genetic traits in flax.
In 1911 Tammes was granted an honorary doctorate in zoology and botany. From April 1912 she replaced Moll as head of practical microscopy. In 1919 she was appointed extraordinary professor of variability and genetics, the first professor in the Netherlands in this field of research.
From 1932 to 1943 Tammes was editor of the journal Genetica. She was also active in the Dutch Association of Women In Higher Education (Vereniging van Vrouwen met Hogere Opleiding or VVAO) and an outspoken opponent of the principle of eugenics. Tammes died in Groningen in 1947.
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