Most programs require at least a 3.0 GPA, but some do look at your nursing grades compared to your overall GPA. I'm in the dual role track at University of South Alabama. They require a 3.2 GPA, but will make exceptions if your nursing course & science/math GPAs meet the threshold.
When I applied, they did a breakdown of GPA as follows: cumulative GPA, nursing course GPA, science GPA, math GPA, freshman GPA, sophomore GPA, junior GPA, senior GPA, humanities/writing GPA, elective GPA. That way, say if you goofed off your freshman year, but did stellar work your other years, you wouldn't necessarily be dismissed for consideration if you showed improvement. Or if you had a poor GPA when you were young, but went back to school later and had good grades.