This video is about Frederick Griffiths and his transforming agent with streptococcus pneumococci
What is pneumococci?
It is the bacteria that causes pnuemonia
Occurs in two strains: Disease causing Smooth strain (Strain S) Harmless Rough strain (Strain R)
What's the difference between them?
Strain S has a capsule on it's surface whereas Strain R does not
Griffiths experimented by injecting mice
What were the results?
Mice injected wuth live Strian S died
Mice injected with live Strain R survived
Book Name here
One experiment produced something unexpected
The mice injected with a mixture of heat-killed Strain S and live Strain R died. Frederick Griffiths also recovered live Strain S
After many careful experiments he concluded that hereditary material had passed from the dead harmful strain to the live harmless strain. This changed harmless strain R into harmful Strain R This process is called transformation!
Thank you for watching !
I hope you have learnt about this great man and feel inspired to learn about others such as Oswald Avery