You always get mutations because nature isn't perfect, and organisms are complicated. The genetic code accounts for that so that if you get a single point mutation, the probability that it still codes for the same or a similar amino acid is quite high.
That means the protein it codes for can probably still function, which is all nature cares about.
alsokalli t1_j9g9x3i wrote
Reply to What is the biological significance of the fact that the genetic code is degenerate? by camilia_stone24
You always get mutations because nature isn't perfect, and organisms are complicated. The genetic code accounts for that so that if you get a single point mutation, the probability that it still codes for the same or a similar amino acid is quite high. That means the protein it codes for can probably still function, which is all nature cares about.
(This is very, very simplified)