Rare Females

I have an Idea regarding human genetics that is associated with an intriguing possibility. It is possible that something that I think I know on this subject is erroneous, which would render my Idea unBake-able by Nature. Therefore I need to explain what I think I know, in order that the esteemed members of this site might point out any flaws --but also to explain why the Idea might make sense.

Thanks in advance for your patience in wading through the following.

Sometimes an ovum is constructed that contains no nuclear DNA of its own. If a sperm containing a Y chromosome merges with that ovum, the first thing that happens is, all the DNA in the sperm gets duplicated, so that every chromosome becomes part of a pair.

However, a zygote with a YY chromosome pair is not viable, and leads to a medical condition known as a "molar pregnancy", involving a thing called a "hydatidiform mole". Such a pregnancy must be terminated lest it cause "trophoblastic disease".

But what if the sperm had an X chromosome instead? In that case the initial duplication process should yield an XX pair for the zygote, which has a chance of being viable, forming a normal female body.

I fully understand that in such a case every single genetic defect in all the chromosomes would be duplicated and result in a matched defective gene-pair. An actual normal female body resulting from the preceding events might be extremely rare; the zygote might not actually ever be viable enough to ultimately yield even a living female body, much less a normal one.

Still, I find the possibility intriguing, that a few women might be walking around, each of whom doesn't have any of her mother's nuclear DNA (she will have her mother's mitochondrial DNA), but only has nuclear DNA from her father's mother. If she is normal, she must have a nearly defect-free gene chart!

Has anyone thought to look for that? Or found some evidence for it by accident?