Genetics + more
A complete mole is formed when a sperm
fertilizes an empty egg & duplicates, or when two sperm fertilize an empty egg.
It has 46 chromosomes(all paternal). A partial mole develops when two sperm(or one sperm that duplicates) fertilize an egg & has 69 chromosomes. Fetal parts are usually only found in partial moles
. Complete moles inc risk for choriocarcinoma(a type of tumor) more than partial moles.
Answer assisted by Brittany Chan, Medical Student