linux for + sed

for i in {B,C,D,E,F};
do
        cp MtSnpA.sh MtSnp${i}.sh
        sed -i 's/mtDNA/M24/g' MtSnp${i}.sh
        sed -i "s/A\.1/$i\.1/g" MtSnp${i}.sh
        sed -i "s/A\.2/$i\.2/g" MtSnp${i}.sh
done