The adenine of the start codon is located at the +1 position. use the dna mutations interactive to determine which statements describe missense mutations. a substitution of g to u at position +13 in the sense strand a transition at position +12 in the antisense strand a transversion of c in the sense strand of the histidine codon a g nucleotide is inserted after position +1 in the antisense strand a deletion of the a at position +7 in the antisense strand an insertion of a between positions +7 and +8 on the sense s