What is associated with: around 1940 scientists found that mutations in these chromosomal units result in defective enzymes?

What is associated with: around 1920 plates of this silicon mineral were first used to control radio frequencies? What is associated with: around 1927 this american known for his mobiles created a portrait of josephine baker out of w… What is associated with: around 1930 angelos sikelianos tried to revive the famous festival of this town navel of the w… What is associated with: around 1930 william lear invented one of these for the car marketed under tha name motorola? What is associated with: around 1948 she moved into slums to help the poor on oct 19 2003 she was beatified? What is associated with: around 1950 3 southeast asian states were given some autonomy ending the union known as french… Based on the clue 'around 196 bc this general became chief magistrate...', what is the answer? What is associated with: around 1964 the north vietnamese began to turn this famous supply route into a real road that…