Because there are 64 possible codons and only 20 amino acids
A) many mutations have no effect on phenotype.
B) every mutation has some effect on phenotype.
C) each tRNA molecule contains two extra amino acids.
D) each tRNA molecule contains two extra codons.

Question

Quizplus · Accepted Answer

There are more codons than there are amino acids, which means that different codons can code for the same amino acid. Thus, a mutation in the codon that codes for an amino acid may result in a new codon that still codes for the same amino acid, leading to no change in the resulting protein and no effect on the phenotype. This is called a silent mutation and is an example of how some mutations can have no effect on phenotype.

Because There Are 64 Possible Codons and Only 20 Amino