Wobble helps to account for the degeneracy/redundancy in the genetic code, where multiple codons match up with one amino acid in many cases. The low-fidelity binding of the last base in the anticodon can match more than one base, allowing one tRNA to read multiple codons. Thus, not all anticodons need to be represented in the pool involved in translation.
Work Step by Step
To understand this, see Table 15.1 for how some amino acids have multiple codons matched up with them. The wobble in the binding of the last RNA base allows for one anticodon to bind, with lowered fidelity, to more than one codon.