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Weismann Barrier
- Weismann distinguished somatic cells from germ cells in multi-cellular organisms, and he proposed that changes made to somatic cells cannot be passed to germ cells or to the next generation, a theory later called the Weismann Barrier.
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In Weismann's opinion the largely random process of mutation, which must occur in the gametes (or stem cells that make them) is the only source of change for natural selection to work on. Weismann became one of the first biologists to deny Lamarckism entirely. [5]
- University of Göttingen
- 17 January 1834, Frankfurt am Main, Germany
- Darwin–Wallace Medal (Silver, 1908)
- Germ plasm theory
Jan 26, 2015 · Additionally, Weismann elaborates a theory for variation within a group of related organisms, claiming that variations in germ-plasm cause those groups to evolve. He hypothesizes two causes of variations, the first relies on environmental factors, such as nutrients, the second on the multiplication of determinants.
May 23, 2014 · Weismann also promoted Charles Darwin's 1859 theory of the evolution of species. Weismann argued that only changes to the germ cells, and not body cells, could be inherited, a theory that influenced theories of heredity throughout later centuries.
Apr 15, 2024 · August Weismann was a German biologist and one of the founders of the science of genetics. He is best known for his opposition to the doctrine of the inheritance of acquired traits and for his “germ plasm” theory, the forerunner of DNA theory.
Weismann first proposed this theory in 1883; it was later published in his treatise Das Keimplasma (1892; The Germ-Plasm: A Theory of Heredity). This view contradicted Lamarck’s theory of acquired characteristics, which was a prevalent theory of heredity of the time.
- The Editors of Encyclopaedia Britannica
Jun 3, 2022 · Weismann’s theory postulated the existence of several levels of hypothetical units. By the 1890s, it was agreed that individuals begin as cells, those cells contain nuclei, and that nuclei contain chromosomes.
Science. Encyclopedias almanacs transcripts and maps. August Friedrich Leopold Weismann. views 2,194,599 updated. August Friedrich Leopold Weismann. 1834-1914. German Biologist. A ugust Weismann, an early adherent to Darwin's theory of evolution, became famous for his studies on heredity.
