How about this for an example. You take a Drow adopted by humans. In this case, a paladin took a drow girl back to his church -- where the girl was raised within the faith of Iomedae. Using the Adopted trait, this allows the selection of a human race trait.
In that list, I see 'Dual Talent' which allows a +2 racial bonus to two abilities. the description explains that this replaces the human's normal +2 to one ability, the bonus feat and the skilled trait.
On a drow, what would a Dual Talent replace?