Answer:
5 bases
Explanation:
If there are 17 amino acids and only 2 bases that can be combined in order to make a codon then:
for 4 bases
is 16 and it is not enough combination for all 17 amino acids
for 5 bases
is 25 combinations (meaning that more than one codon could code for the same amino acid).
Heterozygous (brainly needs me to put more characters in)
<span>Gene expression would be the answer.</span>