Racial Natural Attacks and bonus Class Attack

[LittleFIsh]

My question is related to races that have natural attacks, such as claw and/or bite attacks.

If a race has the racial trait for a claw and/or bite attack for 1d4 damage and then gains a class ability for a claw and/or bite attack for 1d4 damage, what would be the ruling:
>>> damage becomes 2d4
>>> damage become 1d4 +1
>>> damage remains as 1d4

It would make sense that there is extra damage due to the bonus class damage as from a Draconic Bloodline Sorcerer or the like. To me it would be like the claws and/or teeth (bite attack) become sharper or longer to deal the extra damage.

[Java Man]

As written you get no benefit from having both, only the stronger applies.

[wraithstrike]

If both say 1d4 then it stays at 1d4. If one was 1d4, and another was 1d6 then it would go to 1d6.