Question with course credit when changing majors

<p>Hi, I'm going into sophomore year and I'm changing my major from biology to Business administration. I have taken courses that have satisfied the general prereqs for biology. However, if I plan to change my major I will need to take some similar courses that state that I will not receive credit for the previous ones that I have taken.</p>

<p>Does this mean that I won't get the units for the courses I have already taken and if so, how will that affect my gpa? Thanks!</p>