Board Thread:Naruto Discussions/@comment-3306440-20140416120407/@comment-28861328-20140421041840

Why is grass green? Genetics don't rely on chakra. Chakra relies on genetics. The point is you have no way of knowing if she was or wasn't born with those eyes, because you aren't told that. You are simply told that she has them.

That's all.

Which still is not the argument. The argument is that Naruto will get a Rinnegan, which is completely and totally false, unless Sasuke starts feeling particularly generous with his eyes.