Originally posted by StiltmanFTW
That's exactly the case with reincarnation. Only the spirit remains the same.
Maybe, maybe not. What I do know, is that "reincarnated" people seem to perfectly resemble the originals. For example Jean, when reincarnated, had all the same genetically inherited features as the original: red hair, green eyes, etc. This implies the same genes.
As a side note, many of the "clones" in MU are not actually perfect clones:
X-23 cannot be a perfect clone of Wolverine, since they differ in their XY-chromosomes.
Kaine cannot be a perfect clone of Peter Parker since the former has genetic defects. Neither can most of the "clones" created by the Jackal. Ben Reilly... maybe?
Madelyne originally couldn't be a perfect clone of Jean, since the former didn't register as a mutant (which is a genetic trait).