The idea that organisms pass on information has been with us for centuries – any look at three generations of humans (grandfather, father, and son, say) will usually demonstrate that, somehow, physical features are hereditary. The theory of evolution also assumes that a given generation of a species is a continuation, and perhaps adaptation, from its preceding generations and yet, for a long time, there weren't any good explanations of how species inherit traits.
DNA was isolated in 1869, and over the next 50 years scientists gradually refined their understanding of the molecule. Around 1930, scientists began to hypothesize that DNA was a carrier of hereditary information. In 1943, Oswald Avery confirmed that hypothesis.
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http://www.wonderwhizkids.com/index.php/dna-molecule
DNA was isolated in 1869, and over the next 50 years scientists gradually refined their understanding of the molecule. Around 1930, scientists began to hypothesize that DNA was a carrier of hereditary information. In 1943, Oswald Avery confirmed that hypothesis.
read more.....
http://www.wonderwhizkids.com/index.php/dna-molecule
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