What will most likely be the effect of the change in the DNA molecule?

Code for different protein. If there is a change in DNA molecule, the most likely effect will be that a different protein will be coded for. The mutation is the process whereby a change occurs in the DNA molecules; this causes a change in mRNA transcribed and, ultimately, the protein that will be translated.

If the change codes for the same amino acid as all amino acids have more than one codon, this type of mutation is known as silent mutation. If the change causes a change in amino acid, either a missense or nonsense mutation has happened. This is used to determine the functionality of the protein produced.