D. Adding another base pair will re-arrange your DNA sequences and cause an insertion mutation. This will make your codons group of differently, and possibly give you a BAD mutation. However, sometimes the codons still make the same proteins as its supposed to, the mutation will NOT affect you.
Example:
THE BIG FAT CAT ATE THE RAT
Now, if i were to add a letter (X) to this and make the letters group up in three aka the codons:
THE XBI GFA TCA TAT ETH ERA T
As you can you can see, adding a base pair in a DNA insertion will usually have a negative effect, specifically a insertion mutation.
