Alter Self

[Amphetryon]

Not sure there's a meaningful difference between bonus and extra, though, which the argument appears to depend on; neither is ever given any formal definition that works in this context (since a bonus feat is certainly not "a positive modifier to a die roll feat", whatever else it may be), so the standard English meanings, which are synonymous for most if not all purposes, must be used instead.

Merely out of curiosity, do you read Alter Self to grant an extra Skill Point if used to turn into a Human? 4th Level Gnome Sorcerers (for instance) could find that mighty handy to weasel into some PrCs, if you only check eligibility on entrance.