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August Weismann proposes that a cell's genetic material diminishes each time the cell divides.
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Wilhelm Roux proves Weismann's theory by conducting an experiment in which he destroyed one cell of a 2-cell frog embryo, and only a half-embryo developed.
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Dreisch challenged Weismann's theory by conducting an experiment in which he showed that blastomeres separated from 2- and 4- cell sea urchin embryos could still develop into larvae.
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Hans Spemann splits a two-cell salamandetr embryo into tow parts, and both parts developed into two organisms, which
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Walter Sutton hypothesized the exsistance of chromosomes in the nucleus.
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Spemann published the resutls of his experiments that he did back in 1914 and creates the basis for cloning.
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Gurdon clones South Africian frogs of two different adults and creates a cloned South Africian frog.
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Cloned two diferent carrot roots cells to create a successful carrot plant that proved cloning from different cells was possible and could work.
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James Shpiero and Johnathan Bechwith isolated the first gene
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Karl Illmensee cloned three mice.
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Steen Willadsen successfully cloned a sheep using nuclear transfer.
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Ian Wilmut and Keith Campbell clone a sheep and name it Dolly
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