See Also: Johannsen, Wilhelm Ludvig(encyclopedia)
Ludvig (as used in expressions)(encyclopedia)
Holberg, Ludvig, Baron(encyclopedia)
Runeberg, Johan Ludvig(encyclopedia)
His, Wilhelm Jr(medicine)
His, Wilhelm(encyclopedia)
His, Wilhelm Sr(medicine)
Schickard, Wilhelm(encyclopedia)
Turk, Wilhelm(medicine)
Weber, Wilhelm(medicine)

Johannsen, Wilhelm Ludvig (sh)




born Feb. 3, 1857, Copenhagen, Den.
died Nov. 11, 1927, Copenhagen

Danish botanist and geneticist.

He supported Hugo de Vries's discovery that variation in genotype can occur by mutation; the new character, while independent of natural selection in its initial occurrence, is then subject to natural selection. Johannsen's Elements of Heredity (1909) became an influential text, and his terms phenotype and genotype are now a part of the language of genetics.