it is physiologically polyploid, undergoing to diploidization due to mitotic reduction of blastomeres

it is created in the zygote, after sperm penetreation to the egg, along with the syngamy of maternal and paternal pronuclei

it is inactive till embryonic genome activation at 8-16-cell stage

it is predominantly condensed in heterochromatin and, therefore, it is silenced and transcriptionally inactive