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Joanna Slusarz Mr. Rock AP Biology November 11, 2003 B.W.&C.-The Era Before Watson and Crick James Watson and Francis Crick are the men attributed with the discovery of DNA's "double helix." However, they based their research on the works of many preceding scientists. It all began in 1865 with Gregor Mendel's garden pea experiments, which revealed the existence of genes and their transfer from one generation to the next. By 1905, it had been learned that within living cells the genes are strung together like beads on the chromosomes, which then copy themselves and separate. But how, no one knew. By the 1920s, it was thought that genes were made of protein. Although DNA (which was identified in 1871 by a young Swiss scientist, Friedrich Miescher), was also a main ingredient in chromosomes, protein, however, was far more interesting to geneticists than DNA because it was in greater abundance, was more complex, and there...

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