Fredrick+Griffith




 * __GENERAL INFO__**
 * British
 * Micro biologist, geneticist
 * Born in 1879, Died in 1941
 * Discovered the transforming principle in 1928
 * Little is known about his childhood and early education
 * Graduated from the University of Liverpool in 1901


 * __HIS EXPERIMENTS__**

In 1928, Fredrick Griffith was performing an experiment with a disease causing bacteria called pneumococcus, and lab mice. He had two strands of the bacteria pneumococcus, virulent and non-virulent pneumococcus. When he injected mice with the virulent bacteria, they died. When he injected the mice with the non-virulent bacteria, they remained healthy. He then heat treated the virulent bacteria and injected it into the mice. He found that this killed the bacteria, and the mice survived. Finally, he mixed heat treated virulent bacteria with non-virulent bacteria, and found that even though he killed the lethal bacteria the mice died. This proved to Griffith that the DNA in the heat treated virulent strand must have been passed on to the non-virulent strand, causing it to become lethal. These experiments proved that DNA is the material that passes on traits.

__**SOURCES**__


 * [|http://encarta.msn.com/encyclopedia_761596377/griffith_frederick.html 
 * [|http://www.bookrags.com/biography/frederick-griffith-wob/ 
 * [|http://library.thinkquest.org/20465/griffith.html  