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May 23, 2014 · In the experiment, Weismann cut off the tails of 901 mice and their offspring for five generations. If acquired characteristics were heritable, Weismann reasoned, the experimental mice should eventually produce offspring with no tails.
- Life
- Contributions to Evolutionary Biology
- Selected Publications by Weismann
Youth and studies
Weismann was born a son of high school teacher Johann (Jean) Konrad Weismann (1804–1880), a graduate of ancient languages and theology, and his wife Elise (1803–1850), née Lübbren, the daughter of the county councillor and mayor of Stade, on 17 January 1834 in Frankfurt am Main. He had a typical 19th century bourgeois education, receiving music lessons from the age of four, and drafting and painting lessons from Jakob Becker (1810–1872) at the Frankfurter Städelsche Institut from the age of 1...
Professional life
Immediately after university, Weismann took on a post as assistant at the Städtische Klinik (city clinic) in Rostock. Weismann successfully submitted two manuscripts, one about hippuric acid in herbivores, and one about the salt content of the Baltic Sea, and won two prizes. The paper about the salt content dissuaded him from becoming a chemist, since he felt himself lacking in apothecarial accuracy. After a study visit to see Vienna's museums and clinics, he visited Italy (1859) and Paris (1...
At the beginning of Weismann's preoccupation with evolutionary theory was his grappling with Christian creationism as a possible alternative. In his work Über die Berechtigung der Darwin'schen Theorie (On the justification of the Darwinian theory) he compared creationism and evolutionary theory, and concluded that many biological facts can be seaml...
1868. Über die Berechtigung der Darwin'schen Theorie: Ein akademischer Vortrag gehalten am 8. Juli 1868 in der Aula der Universität zu Freiburg im Breisgau. Engelmann, Leipzig.1872. Über den Einfluß der Isolierung auf die Artbildung. Engelmann, Leipzig.1875. Studien zur Descendenz-Theorie. I. Ueber den Saison-Dimorphismus der Schmetterlinge. Leipzig.1876. Studien zur Descendenztheorie: II. Ueber die letzten Ursachen der Transmutationen. Leipzig.Apr 15, 2024 · He put the matter to a practical test in a somewhat naively conceived experiment in which he cut off the tails of mice. With painstaking thoroughness, he observed five generations of progeny of tailless parents, 901 mice in all. Needless to say, they all grew normal tails, and Weismann was able to conclude that mutilations were not inherited.
Weismann conducted the experiment of removing the tails of 68 white mice, repeatedly over 5 generations, and reporting that no mice were born in consequence without a tail or even with a shorter tail.
The German biologist August Freidrich Leopold Weismann (1834-1914) was one of the founders of the science of genetics. August Weismann was born on Jan. 17, 1834, at Frankfurt am Main. He early showed intense interest in natural history, and while still a schoolboy he made extensive collections of butterflies, moths, beetles, and plants from the ...
Germ-plasm theory, concept of the physical basis of heredity expressed by the 19th-century biologist August Weismann (q.v.). According to his theory, germ plasm, which is independent from all other cells of the body (somatoplasm), is the essential element of germ cells (eggs and sperm) and is the.
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Jan 26, 2015 · Weismann defines the process of amphimixis as the fusion of the germ-plasms from two parents. Weismann claims that each sex cell only carries half of the idants of a parent, and due to the fusion of idants during amphimixis, the idants of germ-plasm in the zygote doubles.
