what is the purpose of having multiple codons
Codon usage bias There are 64 different codons (61 codons encoding for amino acids plus 3 stop codons) but only 20 different translated amino acids. The overabundance in the number of codons allows many amino acids to be encoded by more than one codon. Because of such redundancy it is said that the genetic code is degenerate. The genetic codes of different organisms are often biased towards using one of the several codons that encode the same amino acid over the othersâ€”that is, a greater frequency of one will be found than expected by chance. How such biases arise is a much debated area of molecular evolution. Codon usage tables detailing genomic codon usage bias for most organisms in GenBank and RefSeq can be found in the HIVE-Codon Usage Table database.[1]
Chod rig The chod rig is a technique for carp fishing, generally regarded as having two main advantages: the way in which it allows a bait to be displayed over soft mud, weed or debris; and the way its distinct shape allows the chosen bait (usually a buoyant substance) to be attached. The latter benefit is also generally utilised in the chod rig's immediate ancestor, the stiff-hinged rig. It revolves around a rig consisting of a rigid or stiff link, an aggressively angled hookpoint and the ability to spring 360 degrees around the axis of the hook.