during the 19th century mendal showed how human characteristics can be passed on through generations
in the 20th century new technology let scientists analyse human cells in great detail
they found every cell in the body contains DNA
watson and crick worked on how the genetic codes of DNA fitted together
they analyed X-ray crystallography at king's college hospital- eventually worked out the double helix structure of DNA
in 1990, watson led the human genome project- mapping out every gene in human DNA
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