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Wilhelm Ludvig Johannsen. 1857-1927. Danish Geneticist and Botanist. W ilhelm Johannsen is considered one of the founders of genetics. His research provided evidence supporting the mutation theory of Hugo de Vries (1848-1935), which holds that there are sudden, spontaneous appearances of new characters or traits in existing species.
Jun 1, 2014 · Among Wilhelm Johannsen's discoveries was a method for breaking winter dormancy in plants by treatment with ether, widely used in the gardening business (Roll-Hansen 2009). Through chemical analyses of barley grain, in the interest of brewing, Johannsen came to plant breeding.
Johannsen's concept of genotype was derived from the idea of species in the tradition of biological systematics from Linnaeus to de Vries: An individual belonged to a group - species, subspecies, elementary species - by representing a certain underlying type (S. Müller-Wille and V. Orel, 2007. Annals of Science 64: 171-215).
Dec 23, 2015 · In addition to his experiments on selection in pure lines, Wilhelm Johannsen (1857–1927) performed less well-known hybridisation experiments with beans. This article describes these experiments and discusses Johannsen’s motivations and interpretations, in the context of developments in early genetics. I will show that Johannsen first presented the hybridisation experiments as an additional ...
Nov 11, 2022 · Wilhelm Johannsen, a Danish botanist and geneticist, died Nov. 11, 1927, at age 70. In 1900, the work of Gregor Mendel was rediscovered, independently, by three researchers, and almost immediately there was interest in merging Darwinian natural selection and Mendelian genetics. The general belief among Darwinians was that natural selection ...
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Wilhelm Johannsen (3 de febrero de 1857 - 11 de noviembre de 1927) fue un farmacéutico, botánico, fisiólogo vegetal y genetista danés. Es mejor conocido por acuñar los términos gen, fenotipo y genotipo, y por su 'línea pura' de 1903; experimentos en genética. Biografía. Johannsen nació en Copenhague.
