Before You Read In 1953, James Watson and Francis Crick discovered the
structure DNA. But they were not the first people to ask
“How is genetic information passed from one generation to
the next?” Watson and Crick's work was possible because o
the work of other scientists. On the lines below, identify a
task that is possible only because of the work of many peop
Then read the section to learn more about how scientists
discovered that DNA is the genetic code.