Bøker av Wilhelm Johannsen

This work has been selected by scholars as being culturally important, and is part of the knowledge base of civilization as we know it.This work is in the "public domain in the United States of America, and possibly other nations. Within the United States, you may freely copy and distribute this work, as no entity (individual or corporate) has a copyright on the body of the work.Scholars believe, and we concur, that this work is important enough to be preserved, reproduced, and made generally available to the public. We appreciate your support of the preservation process, and thank you for being an important part of keeping this knowledge alive and relevant.

The Danish plant scientist Wilhelm Johannsen (1857-1927) is remembered for his experimental work on plant heredity, and as a founding figure of modern genetics. The terms 'gene', 'genotype' and 'phenotype' were first used by him. The results of his studies on beans supported theories advanced during the 1890s by the Dutch botanist Hugo de Vries, who had unknowingly replicated the work of Gregor Mendel, published in English translation in 1902 (also reissued in this series) by William Bateson. Johannsen's proposal that changes in heredity resulted from sudden mutations rather than from slow processes of natural selection was seen at the time as a threat to Darwinian theory, though later research showed otherwise. This influential book, first published in 1909 (with later editions in 1913 and 1926), is a revised, expanded German translation of a 1905 Danish book by Johannsen, itself based on a journal article originally published in 1903.