Here is a site that may be helpful. It explains NF1 and NF2.
The way I remember what chromosone is responsible for NF2 is 22,
as it is the more severe of the 2, sooooo 22. Chromosone 17 is
the one that is responsible for NF1. Here is the URL to the site.
http://www.nfaireland.ie/nf.htm