Element Benders can pass on their abilities genetically. I'm wondering is an avatar that has access to more elements than usual is able to pass on more than their native bending talent. We haven't, to my knowledge much to go on but this family tree.
I doubt we'll see any hard evidence soon (i.e. proof by contradiction), but if there is something I've missed theory wise, it would help answer.
I see two lines of thought on this:
- Being an avatar is if not hereditary, some how genetic. Some portion of gene could be passed on unlocking non-native bending.
- Being an avatar is purely spiritual, and cannot be 'passed on' as with normal bending genes. This may imply however that non-avatars can become avatars if they contemplate their navels thoroughly enough...
Which one is correct, or is there a third option?