how can sterotyping affect group relations?

Answer 1

Possibly these article can help:

http://www.members.cox.net/dagershaw/lol/Prejudice.html
http://www.members.cox.net/dagershaw/lol/PrejudiceChanges.html

Although the second article does not specifically mention stereotypes, it does rely on them.

I hope this helps a little more. Thanks for asking.