Each codon specifies only 1 amino acid
UNAMBIGUOUS
Most amino acids are coded by multiple codons
DEGENERATE/REDUNDANT
EXCEPTIONS: methionine (AUG) and tryptophan (UGG)
Read from a fixed starting point as continuous sequence of bases
COMMALESS, NONOVERLAPPING
EXCEPTIONS: some viruses
Genetic code is conserved throughout evolution
UNIVERSAL
EXCEPTION IN HUMANS: MITOCHONDRIA