Question

Summarize the experiment in which Griffith became aware that hereditary information could be transmitted between two organisms in an unusual manner.

Answer 1

Answer:

In his experiment, Griffith used two strains of  Streptococcus pneumoniae type II- rough(R) strain and a type III smooth(S) strain. The type III smooth strain had an outer polysaccharide capsule which makes smooth strain a virulent strain.

So in his experiment, Griffith injected these strains in mice in an order and observed the result. When he  

injected living S strain- Mice died

Injected living R- strain- Mice survived

Injected heat-killed S strain- Mice survived

Injected heat S strain+ living R strain- Mice died

So after his experiment, he concluded that R strain took something from heat killed S strain which transformed the R strain into virulent strain that killed the Mice. So based on this experiment Griffith gave transformation principle.