| List $I$ | List $II$ |
| $A$. Frederick Griffith | $I$. Genetic code |
| $B$. Francois Jacob and Jacque Monod | $II$. Semi-conservative mode of DNA replication |
| $C$. Har Gobind Khorana | $III$. Transformation |
| $D$. Meselson and Stahl | $IV$. Lac operon |
Choose the correct answer from the options given below:
$A.$ Variation at genetic level arises due to mutations.
$B.$ Technique of $DNA$ fingerprinting was initially developed by Alec Jeffreys