The table shows the DNA triplet codes for some amino acids.
The base sequence on the DNA strand coding for a polypeptide is shown.
CCA TTC ACG GCG TTA GCA
Two mutations occur in this sequence during DNA replication.
Which mutated DNA would have no effect on the polypeptide synthesised?

1 )
CCA ATC ACG GCG TTG GCA
CCA TTC ACA GCA TTA GCA
3 )
CCA TTC ACG CCG TTA GCC
4 )
CCT TTC ACG GCG TTA GGA
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