Which of the following statements correctly describes the effect a nonsense mutation would have on a gene? a) it changes an amino acid in the encoded protein. b) it alters the reading frame of the mrna. c) it introduces a premature stop codon into the mrna. d) it has no effect on the amino acid sequence of the encoded protein.

c) It introduces a premature stop codon into the mRNA

Explanation:

Nonsense mutation is a type of point mutation (single nucleotide base is changed) which leads to premature stop codon. Stop codons are also called nonsense codons and that is way this type of mutation is called nonsense mutation. As a consequence, synthesized protein is incomplete and shorter than it should be (truncated protein), usually nonfunctional.

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