Why are mutations uncommon in normal cells?
A) Only 25 percent of the genome codes for proteins; therefore, the probability is low that a mutation would occur in a protein-coding region.
B) Most mutations occur after DNA replication.
C) Many amino acids are coded for by more than one codon.
D) The mutation rate during DNA replication is 1 in 100 nucleotides.
E) The mutation rate during DNA replication is zero.

Question

Quizplus · Accepted Answer

The redundancy in the genetic code means that many amino acids are coded for by more than one codon, which can buffer the effects of mutations.

Why Are Mutations Uncommon in Normal Cells