Explain in short : Molecular phylogeny

Explanation

During cell division, changes in the DNA leads to changes in the proteins. These changes accumulate from one generation to the next.
Molecular phylogeny is therefore used to trace the changes in DNA backwards in time and find out how each change diverged from the other.
Approach of molecular phylogeny is based on the idea that more distantly related organisms will accumulate a greater number of differences in their DNA. Such studies trace the evolutionary relationships and this relationship among different organisms is shown by molecular phylogeny which also matches with the classification scheme.