[QUOTE=Dragon Mage;1869276]Okay, this needs to be settled.

Jenova is more Sephiroth's mother than whats-her-face(sorry can't remember he name) ever was. Sephiroth grew up thinking that Jenova was his mother and he most likely has never heard of whatsherface. Jenova's DNA probably over powers whatsherface's so much that Sephiroth can be considered more alien than he is human. (call him a hybrid...) That's why he is so powerfull.
/QUOTE]

He grew up thinking someone named Jenova was his mother not the Jenova. Judging how human Sephiroth looked I doubt you could really say he had more Jenova cells then Human Cells.