Codon Bias Suggests That

Question

Codon bias suggests that
A)some codons evolved earlier than others.
B)not all nonsynonymous substitutions are neutral.
C)some codons are selectively favored over others.
D)small fitness effects can make a large difference over time.
E)some tRNAs are more abundant than others.

Accepted Answer

Codon bias refers to the non-random usage of synonymous codons during translation. This bias can occur due to selective pressure favoring certain codons that are translated more efficiently or accurately by the available tRNA molecules. Therefore, choice C is the best answer as it describes the selective advantage of certain codons over others. The other choices are not directly related to the concept of codon bias.