A three-nucleotide sequence of DNA or mRNA that specifies a particular amino acid or termination signal; the basic unit of the genetic code.
Three-base sequence in a transfer RNA molecule base that pairs with a complementary codon in mRNA
A violation of the base-pairing rules in that the third nucleotide (5' end) of a tRNA anticodon can form hydrogen bonds with more than one kind of base in the third position (3' end) of a codon.
Random errors in gene replication that lead to a change in the sequence of nucleotides; the source of all genetic diversity
agents, such as chemicals or radiation, that damage or alter genetic material (DNA) in cells