Redundancy of the genetic code?
One particular codon codes only for one amino acid, but an amino acid can be coded for by several different codons. Now according to the genetic code, the codon `UUU` codes for the amino acid phenylalanine and `UUA` codes for leucine. But, according to the Wobble Hypothesis, the base on the third position of the codon and that on the anticodon need not be complementary (which helps explain why there are very few types of tRNA molecules, inspite of there being 61 codons). If this hypothesis is true, then we could have a phenylalanine placed in a position which was meant to be for leucine, and vice versa (since the codons coding for them differ only in their third base). The same holds true for pairs like aspartic acid & glutamic acid and serine & arginine. So how does translation of a particular mRNA molecule result in the right polypeptide sequence?