Karl Wilhelm von Nägeli (March 27, 1817 - May 10, 1891) was a Swiss biologist. He discovered what would later become known as chromosomes. Nägeli was born in Kilchberg near Zürich. He studied medicine in Zürich and began working with Manfred Schleiden in 1840. In 1849 he became professor in Zürich, and in 1857 moved to Munich to become professor of botany. Nägeli died on May 10, 1891, in Munich.

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