character: Gregor Mendel
topic: Chromosome Theory
grade: 9
subject: Biology
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character: Thomas Hunt Morgan
topic: Linkage and Genetic Variation
grade: 9
subject: Biology
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character: James Watson and Francis Crick
topic: Structure of DNA
grade: 9
subject: Biology
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character: Barbara McClintock
topic: Genetic Elements and Variation
grade: 9
subject: Biology
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