Job Duties or Roles in Sales vs. Marketing

Thanks for all the great responses for my last question regarding Sales versus Marketing. I am really learning a lot!

Now I have another question which may be easier to answer. If you have a partnership and you are splitting up the responsiblities for who does what for the business, would you split up the sales duties from the marketing duties or are they basically the same? If you split them how would you do it?

Thanks for all the help and information.

Ken