Griffith's experiment with mice was a groundbreaking study in the field of genetics. Here's what it showed:

* Transformation: Griffith demonstrated that a non-virulent strain of bacteria could be transformed into a virulent strain by exposure to dead, virulent bacteria. This showed that some factor from the dead bacteria could change the living bacteria's characteristics.

* Genetic Material: While Griffith didn't identify the exact factor, his work laid the foundation for later discoveries that showed this factor was DNA, the molecule that carries genetic information.

In short, Griffith's experiment showed that:

* Genetic material can be transferred between bacteria.

* This transferred material can change the characteristics of the recipient bacteria.

This discovery was a crucial step in understanding how genetic information is passed on, eventually leading to the understanding of DNA as the molecule of heredity.