Frederick Griffith
- In 1928 an army medical officer named Frederick Griffith was trying to discover a vaccine against streptococcus pneumoniae , but in lieu made a breakthrough in world of heredity. They did experiments in which they injected strands of bacteria in to mice, strand that was harmless (R) and that was harmful (S).
- Frederick Griffith
- In his third experiment, they killed the harmful S cells with extreme heat, and then injected the dead S cells in to the mice and the mice lived.
- In his first experiment, they injected the live R bacteria cells in to the mice and the mice lived.
- In his second experiment, they injected the live S bacteria cells in to the mice and mice died.
- In his last experiment, they added live R cell (which are harmless) to the already dead heat-killed S cells, and then injected it in to the mice, but the mice died!
- Griffith found from this experiment that although they had killed the S cells, they hadn�t destroyed their hereditary material, which was the part that caused the illness! When some more experiments had been completed, it had been discovered that the harmless R cells, had used the information from the hereditary material of the dead S cells and became harmful; this they called, hereditary transformation.
- (Oh and by the way� they never did find the vaccine.)
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