Final answer:
If there is a mutation in a gene that causes a different amino acid to be encoded, it would affect the genetic code and the protein produced by the gene.
Step-by-step explanation:
If there is a mutation in a gene that causes a different amino acid to be encoded than one that is usually encoded in that position within the protein, it would affect the genetic code and the protein produced by the gene.
A missense mutation can result in the substitution of a different amino acid at a specific position in the protein, leading to small changes in the protein structure and function. This alteration in the genetic code ultimately affects the protein produced by the gene.
For example, the substitution of valine for glutamic acid in the hemoglobin protein due to a single nucleotide mutation causes sickle-cell disease in humans, leading to abnormal red blood cells and impaired oxygen transport.