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Who disproved Lamarck's Theory of acquir...

Who disproved Lamarck's Theory of acquired characters? How ?

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August Weismann conducted experiments on mice for 20 generations by cutting their tails and breeding them. All mice born Were with tail. He proved that change in the somatoplasm will not be transferred to the next generation whereas changes in the germplasm will not be transferred to the next generation whereas changes in the germplasm will be inherited.
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