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B
Leeuwenhoek
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C
Virchow
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D
Hooker
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Solution
The correct option is A Muller The mutagenic property of mutagens was first demonstrated in 1927, when Hermann Muller discovered that x-rays can cause genetic mutations in fruit flies, producing phenotypic mutants as well as observable changes to the chromosomes. His collaborator Edgar Altenburg also demonstrated the mutational effect of UV radiation in 1928.
Muller went on to use x-rays to create Drosophila mutants that he used in his studies of genetics. Thus, the correct answer is option A.