Bacterial transformation is when the genes of a cell is altered by a direct uptake, as shown in Stanley Cohen and Herbert Boyer's experiment. Bacterial transduction is another process where DNA is transferred from one bacterium to another bacterium by a virus. They showed bacterial transformation, and later bacterial transduction, by inserting the recombinant DNA they made into the E. coli bacteria by the process of plasmid. Through that they were able to induce the uptake and show the expression of a new DNA sequence, showing the process of bacterial transformation.
(The above post is based on the following link: http://www.dnalc.org/view/15916DNAtransformation.html.
The pictures above are taken directly from the link; not all of the steps are shown in the pictures above.)
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