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- August Friedrich Leopold Weismann studied how the traits of organisms developed and evolved in a variety of organisms, mostly insects and aquatic animals, in Germany in the late nineteenth and early twentieth centuries. Weismann proposed the theory of the continuity of germ-plasm, a theory of heredity.
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May 23, 2014 · From 1878 to 1883, he investigated how sex cells were generated in Hydromedusae, a small jellyfish-like marine invertebrate. He also studied parthenogenesis, a form of asexual reproduction that allows the egg to develop into a new organism without fertilization, in Cladocera, a type of water flea.
Jun 11, 2018 · WEISMANN, AUGUST FRIEDRICH LEOPOLD (b. Frankfurt am Main, Germany, 17 January 1834; d. Freiburg im Breisgau, Germany, 5 November 1914), zoology. Weismann’s most influential contribution to biological thought was his theory of the continuity of the germ plasm, an explanation of heredity and development.
- August Weismann Family Background and Education
- Academic Career
- Weismann on Evolution
- On Inheritance
August Weismann was born in Frankfurt am Main, Germany, as the son of the high school professor Johann (Jean) Konrad Weismann, who had studied ancient languages and theology, and his wife Elise, née Lübbren, daughter of the district administrator and mayor of Stade. Weismann started receiving piano lessons at the age of 14 and was introduced into c...
From 1863, the year of his habilitation in zoology in Freiburg, Weismann was a private lecturer, from 1865 an unscheduled professor, from 1867 a full professor and finally from 1873 until his retirement in 1912 professor of zoology at the first chair of zoology in Freiburg and director of the Zoological Institute at the University of Freiburg; in 1...
In the 1870s, Weismann began working in the field of zoology as the director of the zoological institute at the University of Freiburg and started researching freshwater fish all over Europe. In his first works on evolutionary biology, Weismann compared creational theories with those of Charles Darwin. He examined both and was finally convinced of ...
In 1883, Weismann gave a talk titled ‘On Inheritance‘ and this was the first time, when he rejected the inheritance of acquired traits. Again, he attempted to explain individual examples with creation and evolution. Weismann tried to describe the existence of non-reproductive castes of ants, such as workers and soldiers, that cannot be explained by...
Early Embryological Work. Weismann's early research was mainly in the field of embryology. He published six classical studies on the embryonic and postembryonic development and metamorphosis of insects between 1862 and 1866.
August Weismann. 1834-1914. German biologist who was an early adherent of Darwin's theory of evolution and became famous for his studies on heredity. He denied that organisms could inherit acquired characteristics, touching off an important debate between his followers and the opposing neo-Lamarckians, who believed organisms could inherit ...
August Friedrich Leopold Weismann FRS (For), HonFRSE, LLD was a German evolutionary biologist. Fellow German Ernst Mayr ranked him as the second most notable evolutionary theorist of the 19th century, after Charles Darwin.
This chapter focuses on August Weismann's theory of the germ-plasm. It is argued that both Weismann's failure to conceive of any alternative to the disintegration of the idioplasm as the mechanism of ontogenetic differentiation and nuclear control, and his failure to conceive of any genuinely facultative capacity on the part of the germ-plasm ...
