Weismann, August (1834–1914) German biologist. His essay discussing the germ plasm theory, The Continuity of the Germ Plasm (1885), proposed the immortality of the germ line cells as opposed to body cells. It was influential in the development of modern genetic study. Experiments on rats The idea that germline cells contain information that passes to each generation unaffected by experience and independent of the somatic (body) cells, came to be referred to as the Weismann barrier, and is frequently quoted as putting a final end to the theory of Lamarck and the inheritance of acquired characteristics. Lamarck had claimed that the inheritance of characteristics acquired through effort, or will. Weismann conducted the experiment of chopping of the tails of fifteen hundred rats, repeatedly over 20 generations, and reporting that no rat was ever born in consequence without a tail. He stated that "901 young were produced by five generations of artificially mutilated parents and yet there was not a single example of a rudimentary tail or any other abnormality of the organ".[11] Weismann was aware of the limitations of this experiment, and made it clear that he embarked on the experiment precisely because, at the time, there were many claims of animals inheriting mutilations (he refers to a claim regarding a cat that had lost its tail having numerous tail-less offspring). There were also claims of Jews born without foreskins. None of these claims, he said, were backed up by reliable evidence that the parent had in fact been mutilated, leaving the perfectly plausible possibility that the modified offspring were the result of a mutated gene. The purpose of his experiment was to lay the claims of inherited mutilation to rest. The results were consistent with Weismann's germ plasm theory.

You obviously have a computer and this sounds like homework. Can't you look up your own answers? You are like the guy who would sit and watch a tv show you didn't like because the remote is sitting next to the tv set and you would need to get up and walk 4 feet. Sad, really sad.