Question

if there is a mutation that occurs on the seventh DNA codon on the template strand...that transforms a Guanine to an Adenine in the sequence. What would be the overall effect on the synthesis of the protein and why?

Answer 1

If there is a mutation that ocurs on the seventh DNA codon on the template strand ... that transforms a Guanine to an Adenine in the sequence.

Here one base is changed , guanine is changed to adenine in the template strand. The mRNA is coded by template strand. If one base is changed in the template strand , it affects the corresponding base in the mRNA. When Guanine is present on the template strand , the seventh codon on mRNA was cytosine. Now guanine is changed to adenine. So seventh codon in the mRNA changes to Uracil. This affects the one  aminoacid coded by mRNA. There is a change polypeptide produced. It affects protein synthesis. There is a change in one aminoacid when compared to the sequence prior to mutation.

This mutation on template strand affects the synthesis of protein.