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Stanley Cohen and Herbert Boyer, two
American researchers, made the first
genetic experiment. Genetic Engineering is
altering the sequence of DNA molecule.
 They recombined and introduced genes
into bacteria. They cut DNA using restriction
enzymes at different positions and then
recombined them.
 Cohen and Boyer’s technique is used
worldwide and is the most important
discovery in the history of biomedical
research.

An electric current applied to a gel
 Is a technique used to separate DNA,
RNA and protein. Separates charged
molecules by size. DNA fragments are
separated using this process.
 Take advantage of the chemical and
physical properties of DNA
