All of the cells within the embryo sac or female gametophyte are haploid, meaning that there are 3 antipodals close to the chalaza end and 2 synergids at the micropylar end. At the micropylar end is the egg cell as well. However, the central polar cell—a single cell with two polar nuclei—is diploid. Finally, it has 8 nuclei and 7 cells.After fusion,It will become triploid i.e. 3n - Primary Endosperm Nucleus (PEN) The egg cell fusing with male gamete becomes diploid i.e. 2n