Hermann Henking (1858 - 1942) was a cytologist who discovered the X chromosome in 1890 or 1891. The work was the result of a study in Leipzig of the testicles of the Firebug Pyrrhocoris during which Henking noticed that one chromosome did not take part in mitosis. He named this X element because its strange behaviour made him unsure whether it was genuinely a chromosome. It later became X chromosome after it was established that it was indeed a chromosome.
- James Wynbrandt, Mark D. Ludman, The Encyclopedia of Genetic Disorders and Birth Defects, page 395, Infobase Publishing, 2009 ISBN 1438120958.
- James Schwartz, In Pursuit of the Gene: From Darwin to DNA, pages 155-158, Harvard University Press, 2009 ISBN 0674034910
- David Bainbridge, 'The X in Sex: How the X Chromosome Controls Our Lives, pages 3-5, Harvard University Press, 2003 ISBN 0674016211.
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