Question

what is the consequence of having only 20 amino acids when there are 64 possible codons?
o some amino acids can be specified by more than one codon.
o some amino acids can be specified by more than one codon and some codons are non - functional (they are never present in mrnas).
o there are 44 extra codons that do not specify amino acids.
o some codons specify more than one amino acid.

Explanation:

In the genetic code, there are 64 possible codons but only 20 amino - acids. This leads to the phenomenon of degeneracy, where some amino - acids can be specified by more than one codon. There are also stop codons which do not code for amino - acids but signal the end of translation. Non - functional codons that are never present in mRNAs do not exist. Each codon specifies only one amino - acid.

Answer:

Some amino acids can be specified by more than one codon.