Question

which type of mutation always produces a stop codon?
missense
nonsense
silent
point

Explanation:

• A missense mutation changes one amino acid to another.
• A nonsense mutation changes an amino - acid - coding codon into a stop codon.
• A silent mutation does not change the amino acid sequence (due to the degeneracy of the genetic code).
• A point mutation is a general term for a single - base change, which could be missense, nonsense, or silent.

Answer:

B. nonsense