half-identical twins?

[Shanaynay]

Hi twin mummies!

(Bubhub is so huge it took me about half an hour to find the multiples forum!)

I was just wondering if anyone can tell me about half-identical twins.......I've heard that phrase quite a few times lately.

What does it mean exaclty? How can they be half identical?

[Lirael]

Half Identical Twins (Polar Body Twinning)
These twins occur when the mother's egg splits before fertilization and then each half is then fertilized by a sperm.

[FourAngelKisses]

Wow, never heard of that before, how interesting!!