10% experience bonus for good stats

I was reading through some of the AD&D player's manuals and I saw the rule that if a character has a 16 or better in their primary attribute for that class (str for a warrior, dex for a thief, etc) they get an extra 10% experience bonus. I was wondering if Baldur's gate followed that rule?

Second question was I saw that once Wisdom gets above 18 the player becomes immune to certain effects (fear, etc), I was also wondering if BG incorporated that rule as well?

Thanks for any info in regards to this post.