Born 21 Apr 1843; died 4 Aug 1905 at age 62.

#German #anatomist who was the first to observe and describe systematically the behaviour of #chromosomes in the cell #nucleus during normal #celldivision (#mitosis, a term he coined in 1882).

Thus, he was a founder of #cytogenetics as a branch of science to study chromosomes, the cell's #hereditary material.

Flemming coined other terms: #spireme, #aster, #chromatin, #achromatin, #monocentric and #dicentric phases.

Chromatin (Gr. chroma = colour) referred to certain fragments of the cell nucleus that took on a strong colour from the dyes he used during microscopic study.

Flemming did not know of Mendel's work, so 20 years passed before the genetic implications were realized. Chromosomes, formed from cromatin, were named in 1888 by Waldeyer-Hartz.

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