 The cells in the zygote are also replicating synchronously, always undergoing cell division at the same time.The zygote is not producing its own mRNA but rather it is using mRNAs that were produced in the mother and loaded into the oocyte in order to produce proteins necessary for zygotic growth.The zygotic DNA (genetic material) is not being used because it is repressed through a variety of mechanisms such as methylation.