Which type of mutation helped lead to the understanding that the genetic code is based on triplets?

The spermists believed that: the male made the only hereditary contribution to the offspring the male and female traits were blended in the offspring the female made the only hereditary contribution to the offspring the male and the female made equal contributions to the next generation

Fredrick griffith made a scientific discovery in 1928

Darwin’s hypothesis about how life changes over time is now called?