Joe Hin Tjio

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Joe Hin Tjio (; 2 November 1919 – 27 November 2001), was an Indonesian-born American cytogeneticist. He was renowned as the first person to recognize that the normal number of human chromosomes is 23. He discovered this on 22 December 1955 at the Institute of Genetics of the University of Lund in Sweden, where he was a visiting scientist.

Career

1. 1919
   Born
2. 1974
   Won honorary doctorate of Claude Bernard University Lyon 1
3. 1980
   Won honorary doctor of the University of Zaragoza
4. 2001
   Passed away

Trivia

• •Place of birth: Java
• •Citizenship: Indonesia
• •Known as: geneticist