Triploidy(三倍性) Most often due to fertilization by two sperm (dispermy) or occasionally a diploid sperm or gg Partial hydatidiform moles(remnants of placenta# small atrophic fetus): triploid with extra paternal set Mole: from the latin mola, for false conception Extra maternal set: early spontaneous abortionsTriploidy（三倍性） • Most often due to fertilization by two sperm (dispermy) or occasionally a diploid sperm or egg • Partial hydatidiform moles (remnants of placenta ± small atrophic fetus): triploid with extra paternal set – Mole: from the Latin mola, for false conception • Extra maternal set: early spontaneous abortions