Regarding Sitemap and Google Plus

Hi,
I got 2 questions.
1. Check out my site's sitemap. It has both mysite.com and mysite.com/ Is that ok? My preferred url is mysite.com.I think in SEO View both should not be indexed. Advice me on this please.

2. If I link my G+ page for my domain will it affect subsites? I mean Will my profile shows up with their site? How can I prevent that? My site is multisite on sub-domain install.