Weisman's greatest contribution to genetics is to put forward the genetic theory of "germplasm continuity theory" (germplasm theory), including the affirmation of genetic material in the nucleus and“Meiosis”A bold guess at the concept.[2]
In 1861, he learned from German zoologist KG. Loekhart, studying zoogenesis andmorphologyIn 1863, he completed a paper on the metamorphosis of diptera insects.Served in 1866Freiburg UniversityZoology andComparative anatomyAssociate professor, who founded the Institute of Zoology in 1868 and served as the first director, was promoted to professor in 1871.Since the mid-1960s, due to eye diseases, we had to stop microscopic research and turn to the theoretical discussion of genetics, genesis and evolution.He lecturedDarwinismMany years, until retirement in 1912.
Character's Life
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Weismann
Weisman put forward the famous“Germplasm theory”。The germ plasm theory claims that organisms are composed of two fundamentally different parts in nature - germ plasm and physique.It is believed that the changes caused by the influence of the external environment or the use or non use of organs during the life of an organism are only manifested in its physique, and have nothing to do with its germplasm, so the acquiredAcquired traitsIt cannot be inherited.It is believed that germplasm only exists in nuclear chromatin.Weissman believed that chromatin was formed bynucleusA group of legacies formed by the collection of many legacies in.The leftover seeds also contain many granular substances, which are called stators. The stators can also be divided into smaller units - biogeny, which is the smallest unit of life.With ontogeny, each stator is gradually dispersed into appropriate cells, and finally one cell contains one stator.The protons can pass through the nuclear membrane and enter the cytoplasm, making the stator active, thus determining the differentiation of the cell.Germplasm (sex cells), on the other hand, stores all the specific stators of the organism and passes them on to future generations.
Personal achievements
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Weisman's theory of germplasm was supported by the research results of German zoologist Th Boweri on the fertilized eggs of Paralumbricoides equi.Weisman's theory of germplasm inspired people to study genetic material in depth, thus discovering chromosomes, genes and DNA one after another.Therefore, he has certain achievements.
For Darwin's theory of evolution, Weisman only accepted and emphasized the principle of survival struggle, and fundamentally changed Darwin's views on variation and inheritance.Weisman firmly denies the inheritance of acquired traits, and firmly opposes Lamarckism andNeo Lamarckism。Weisman called his theoryNew Darwinism。Weisman once worked with H. Spencer, pathologist RC. Filshaw and zoologist EHeikkerNew Lamarckists, such as R. Simon, the Hertwig brothers, etc. had heated debates.
