In 1869, dna was discovered within the nuclei of cells. by the 1940s, scientists knew that chromosomes were made of both dna and protein but did not know which was the genetic material of cells. in the 1950s, scientists demonstrated that dna is the material responsible for heredity. in 1953, using information collected by other scientists, an american biologist and an english physicist built a three-dimensional model of dna. these discoveries best illustrate the importance of
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