Open main menu

DNA

Revision as of 11:57, 21 September 2018 by NRJC (talk | contribs) (Discovery of DNA)

Key Stage 3

Meaning

DNA is the molecule inside an organism that provides instructions on how to build that organism and how the cells behave inside the organism.

About DNA

DNA is found in the nucleus.
DNA coils together to make chromosomes.
DNA is passed from parent to offspring.
DNA controls most of our physical appearance.
DNA determines your eye colour, nose shape, height, skin colour and whether you are male or female. All of these things can be affected by environment as well, but the DNA provides the original instructions on how to build you.
DNA has a double helix structure, which means it is shaped like twisted ladder.

Discovery of DNA

DNA was first discovered in 1869, but at the time nobody knew how it worked or what its structure was.
In 1928 an experiment with DNA showed that it was responsible for heredity.
In 1953 Francis Crick and James Watson found evidence that DNA was a long double helix molecule.