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Wilhelm Johannsen (3 February 1857 – 11 November 1927) was a Danish pharmacist, botanist, plant physiologist, and geneticist. He is best known for coining the terms gene, phenotype and genotype, and for his 1903 "pure line" experiments in genetics.
mutation theory. phenotype. Wilhelm Ludvig Johannsen (born Feb. 3, 1857, Copenhagen, Den.—died Nov. 11, 1927, Copenhagen) was a Danish botanist and geneticist whose experiments in plant heredity offered strong support to the mutation theory of the Dutch botanist Hugo de Vries (that changes in heredity come about through sudden, discrete ...
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Apr 22, 2013 · Learn how Danish botanist Wilhelm Johannsen coined the word gene in 1909 to describe the Mendelian units of heredity. Find out how he also distinguished between phenotype and genotype, and how his term influenced genetics.
Nov 16, 2012 · Learn about the life and work of Wilhelm Johannsen, who studied plants and helped found the field of genetics. He introduced the concepts of gene, genotype, and phenotype, and challenged vitalism and teleology in biology.
Apr 24, 2024 · Quick Reference. (1857–1927) Danish geneticist who introduced the terms phenotype, genotype, and gene, and was one of the founders of modern genetics. Born in Copenhagen, the son of an army officer, Johannsen was apprenticed to a pharmacist in 1872 and worked in Denmark and Germany, passing his pharmacist's exam in 1879.
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Dec 7, 2012 · Learn how Johannsen proposed the distinction between genotype and phenotype in the study of heredity based on his experiments on barley and bean plants. Explore how his concept influenced the pure line theory, the debate on variation and evolution, and the separation of heredity and development.
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.
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