Originally posted by King Kandy
Oh come on. What are the odds, that for hundreds of years the world was swarming with rinnegan carriers, but only once, in all of history, did two of these people have a child who was an active carrier?
Quite simple, really. It is a probability and the probability works out that every 1000 years, a rinegan user is born.
That does mean, however, that it could be 5000 years or just 1 year. Hell, two could exist at once.
This is where the "mystical" property comes into play. We could pretend that the presence of the rinnegan user, himself, causes a specifc type of alteration to the genetic code that takes 1000 years or 50 generations to "breed-out" the effects from. AHA! It could be some sort of unique chakra "leakage" that causes this delay for 50 generations. And, it's global. Just the same as the new moon eye technique is global, there's something about the chakra being global. Keep in mind that even "chakra seers" like the hyuga clan could not see the chakra strings that controlled Pain's bodies.
Edit
Originally posted by Demonic Phoenix
Let me just clarify and expand on my statement.By recessive traits, I meant alleles. The allele for Rin'nengan can still be passed on, but the Rin'nengan will not appear if it is a recessive trait and a dominant allele is present.
So it also means that two parents who do not have the Rin'nengan could have a child with the Rin'nengan, provided the parents each have the recessive allele.
It further means that both parents would have to have at least one copy of the allele or the Rin'nengan to have a child with the Rin'nengan.
Is that what you meant >__>?
Exactly.
But, that means we would have to account for only one couple possessing both recesssive alleles in order to produce the rinnegan phenotype.
Double edit - By one couple, I mean only one couple produces the rinnegan user ever 50 generations...instead of a bunch. Cause, if only one couple can breed the rinnegan user, then there has to be a mechanism to produce him. Maybe it's the strange chakra dissipating that allows it to happen...still....50 couples could produce the rinnegan user...
damn, we ccould talk this thing all over the place if we wanted to.