Required science courses for math major:
Texas State
Core Curriculum: Requires 6 hours of science. They do not require both to be in the same discipline.
http://mycatalog.txstate.edu/undergraduate/general-education-core-curriculum/
Math major:
http://www.math.txstate.edu/degrees-programs/undergrad.html
For BA and BS in math, requires just completion of core curriculum science requirements. A quick view of the others indicates that they also require only the core curriculum requirements.
UT San Antonio
Core Curriculum: Requires two courses. They do not require that they be in the same discipline.
http://catalog.utsa.edu/undergraduate/sciences/mathematics/#degreestext
Math major: No additional science courses are required.
(Same URL as just above.)
UT Austin
Core Curriculum: Requires 9 hours of "Natural Science and Technology": 6 hours of courses in the same science discipline AND a second requirement for an additional 3-hour science course from a different science field from the other two.
See "Natural Science and Technology I and II" in this list: http://catalog.utexas.edu/general-information/academic-policies-and-procedures/core-curriculum/
Math major: Has a number of options, with different specific science courses prescribed in each.
http://catalog.utexas.edu/undergraduate/natural-sciences/degrees-and-programs/bs-mathematics/
Teaching: Two special requirements: special requirement for a UTeach "research methods" course in biology, chem, or physics and special requirement for one course from a list of "courses that use math," which includes many science courses and many other courses. (Stronger requirement if they will earn certification in both math and physical science)
Actuarial: 8 hours in same area from "majors-level coursework" in astronomy, biology, chemistry, geological sciences, physics
Mathematics: 8 hours in same area from "majors-level coursework" in astronomy, biology, chemistry, geological sciences, physics
Mathematics-Honors: More specific science requirements.