If there were six bases in DNA and still only 20 amino acids, how long would a codon need to be in order to specify an amino acid?

The codon length would not change.

Explanation:

Codons have 3 bases and normally the DNA has 4, each codon counts for a single amino acid. There are 64 possible codon variations which can be calculated by .

If there were 6 bases in the DNA than there would be codon variation that correspond to the same 20 amino acids but the codon lengths would still be the same.

I hope this answer helps.

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