So if this DNA molecule, the DNA helicase molecule moves in the forward direction that means that this DNA polymerase also moves in the forward direction because it creates this new strand from the five to the three direction. However, let's take a look at this upper strand here. So for the case of this upper parent strand if our DNA polymerase reads it this way in the same forward direction then it reads our strand in the five to three direction. But remember our DNA polymerase can only read the parent strand in the three to five direction. So that means the DNA polymerase has to move in the opposite in the backward direction. So what actually happens the way we synthesize this strand, which is known as the Lagging strand is in the following manner.