Question

Identify the types of point mutations depicted.

Glycine (G G C) is transformed to Glycine (G G A).
Glycine Glycine

missense mutation

nonsense mutation

silent mutation
Lysine (A A G) is transformed to stop codon (T A G).
Lysine Stop

missense mutation

nonsense mutation

silent mutation

Answer 1

1) GGC → GGA (Glycine → Glycine): silent mutation (synonymous) — codon changed but amino acid unchanged.

2) AAG → TAG (Lysine → Stop): nonsense mutation — substitution creates a stop codon causing premature termination.