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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.
  1. Jan 13, 2023 · August Weismann, in full August Friedrich Leopold Weismann, (born January 17, 1834, Frankfurt am Main—died November 5, 1914, Freiburg im Breisgau, Germany), German biologist and one of the founders of the science of genetics, who 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.

  2. May 23, 2014 · Weismann taught evolutionary theory for more than forty years, and he published books on evolutionary theory. Weismann's eyesight improved after 1871, so he resumed his microscopic studies. He studied the metamorphosis of butterflies, especially how changes in environmental conditions such as temperature caused variations in the wings of butterflies.

  3. August Friedrich Leopold Weismann FRS (For), HonFRSE, LLD (17 January 1834 – 5 November 1914) 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. Weismann became the Director of the Zoological Institute and the first Professor of Zoology at Freiburg .

  4. 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 hereditary material that is passed from generation to generation.

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  5. Professor Weismann's Evolution Theory, here translated from the second German edition (1904), is a work of compelling interest, the fruit of a lifetime of observation and reflection, a veteran's judicial summing up of his results, and certainly one of the most important contributions to Evolution literature since Darwin's day.

  6. Jan 26, 2015 · In The Germ-Plasm, Weismann proposed a theory of heredity based on the concept of the germ plasm, a substance in the germ cell that carries hereditary information. The Germ-Plasm compiled Weismann's theoretical work and analyses of other biologists' experimental work in the 1880s, and it provided a framework to study development, evolution and heredity.

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