I went through the first page of an extensive forum from 2010 that asks a similar question and doesn't get an answer. Now that there is more information on the subject, I'd like to know for a build I'm working on, a Half-Elf Sorcerer/Oracle/Mystic Theurge: to what extent are half-breeds treated as humans?
Normally I'd just assume that half-elves/orcs can lean towards whatever side of their ancestry they want, but it seems to be controversial enough that I do need to ask what the RAW is. What are half-humans allowed to take that is usually reserved for their halves only?
I'm looking primarily for a RAW answer, but I'd take an RAI answer if no RAW answer exists. Normally I'd be the first to agree that "effects" has nothing to do with favored class bonuses, but it would appear to be accepted that half-elves can take human-only classes, which are not effects by any means.
The half-races in question are primarily half-elves and half-orcs, and at least as far as Favored Class Bonus is concerned the side-bar on those two pages would appear to confirm that yes, half-elves/orcs can take the Favored Class Bonuses of either elves/orcs or humans, but in a broader sense it could also apply to the planar races (aasimars, tieflings, sylphs, ifrits, oreads, and undines, possibly more) that have the following ability (or close variation thereof; this is taken from Aasimar):
Scion of Humanity Some aasimars’ heavenly ancestry is extremely distant. An aasimar with this racial trait counts as an outsider (native) and a humanoid (human) for any effect related to race, including feat prerequisites and spells that affect humanoids. She can pass for human without using the Disguise skill. This racial trait replaces the Celestial language and alters the native subtype.
The biggest reason that this partially extends to them as well is because they now have the Humanoid (Human) type with this trait, which is fine by itself, but according to the sidebar on the same page any humanoid could be an aasimar (or any of the other planar races). As a sub-question to this one, if the prerequisite for human/elf/orc/etc.-only feats, race traits, classes, favored class bonuses, etc. is to have the "Human/Elf/Orc/etc." subtype... would these races with that ability be able to qualify for those things as well?