Otto Bütschli
![Otto Bütschli in 1916](https://upload.wikimedia.org/wikipedia/commons/1/13/Otto_B%C3%BCtschli_%28HeidICON_116096%29_%28cropped%29.jpg)
He was the first scientist to recognize the structures now known as chromosomes. Provided by Wikipedia
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H. G. Bronn's Klassen und Ordnungen des Thier-Reichs : wissenschaftlich dargestellt in Wort und Bild