How does post bacc. work effect GPA?

I'm looking to possibly do post bacc. work with physiology or biomedical sciences, in which after completing the program in a year I will have a master's degree. 1. is this the same as graduate school? or a master's degree? 2. How does this effect undergraduate GPA? How is it weighted?
Source: Student Doctor Network - Category: Universities & Medical Training Authors: Tags: Pre-Medical - DO Source Type: forums