iOS Universal Binary Support?

I'm planning to make an iOS game (though I haven't actually dabbled in Unity iOS yet) and I was wondering if there was support for iOS Universal Binaries--as in, a game which will at native resolution on iPad and iPod/iPhone. This feature is extremely valuable to me. Is it as simple as adding both the iPad and iPod binaries in Xcode?

I'm a Unity developer, not an Xcode one, by the way...this is all very new to me so go easy!