Most amino acids can be encoded by more than one codon. For example, Serine
can be encoded by any one of {UCU, UCC, UCA, UCG, AGU, AGC}
.
My question is in two parts:
1) what are the relative frequencies of those codons? This question can be equivalently phrased in probabilistic terms: What is the probability that a given amino acid was encoded by particular codon?
2) Is this probability dependent on the context (the neighboring codons/amino acids)?