Depending on the Base Position Within as Codon, the Percentage

Essay

Depending on the base position within as codon, the percentage of base changes that alter the interpretation of the codon vary remarkably. Which of the following statements, if any, is true?
a) 100% of all possible base changes to the first base cause an altered interpretation for the codon.
b) 100% of all possible changes to the second base cause an altered interpretation for the codon.
c) About 30% of all possible changes to the third base cause an altered interpretation for the codon.
d) Less than 10% of all possible changes to the third base cause an altered interpretation for the codon.