Question

Griffith injected mice with four different samples of bacteria. When injected separately, neither heat-killed, disease-causing bacteria nor live, harmless bacteria killed the mice. The two strains injected together, however caused fatal pneumonia. From this experiment, Griffith inferred that genetic information could be transferred from one bacterial strain to another.

Infer: Why did Griffith test to see whether the bacteria recovered from the sick mice in his last experiment would produce smooth or rough colonies in a petri dish?