- partial mole has a triploid DNA content: 69 XXX, 69 XXY
- fertilization of a haploid egg by two haploid sperms
- fertilization of a haploid egg by one diploid sperm (rarely)
- the rate of maternal to paternal genetic information is 1 : 2.
Note: not all triplod gestations are partial moles —
see chromosomal aberrations and fetal triploidy.