Hi, thanks for good video! I would like to know how Partial Molar Pregnancy occurs! 1:1000 pregnancies. It comes with triploidy, three sets of chromosomes, and the embryo/foster usually does not survive more than 10.-12. weeks of pregnancy! The pregnant mother has very high Hgc-levels in her body. It can develop into cancer. I am very curious where the ‘defect’ happens in the fertilization process. Is the egg not mature enough, or what effects it?!