Every school I looked at only required you completed the required courses previous to matriculation. Even if you didn't have them on your transcript you could still get in - but if you didn't fulfill a requirement you'd have to do so prior to matriculation.
As for the requirements themselves, it's dependent upon the school in how strict they are, if at all. The vast majority didn't have any specific requirement or would accept any form of writing-intensive course. Even though I had several qualifying English courses, I smuggly put in science-based writing-intensive courses at these programs because I ran out of ways to entertain myself during the application cycle.
As long as you fulfill the requirements prior to matriculation - in the end, it doesn't even matter.