Today, 191 years ago, on January 17, 1834, the German biologist Weissmann was born.

On January 17, 1834, German biologist Weissmann was born in Frankfurt, Germany. In 1892, Weissmann put forward the theory of germplasm continuity, which distinguished germplasm from physique for the first time in the history of biology, and emphasized the stability and continuity of germplasm, which provided basic ideas for the later establishment of chromosome genetic theory and the development of gene theory, and had a huge impact on the development of biology and genetics.