Question

Why are there 64 combinations of genetic codons for only 20 different amino acids?

Answer 1

Because DNA consists of four different bases, and because there are three bases in a codon, and because 4 * 4 * 4 = 64, there are 64 possible patterns for a codon. Since there are only 20 possible amino acids, this means that there is some redundancy -- several different codons can encode for the same amino acid.

Answer 2

Because they all don't code for specific amino acids

Step-by-step explanation:

Some of them don't code for Amino acids, instead, they code for directions. There are also amino acids that can be coded with multiple codons. this is why there are more codons than amino acids