A lot, according to Hans Bader, who sees a coming quota system in Science, Technology, Engineering and Math enrollment:

Quotas limiting the number of male students in science may be imposed by the Education Department in 2013. The White House has promised that “new guidelines will also be issued to grant-receiving universities and colleges” spelling out “Title IX rules in the science, technology, engineering and math fields.” These guidelines will likely echo existing Title IX guidelines that restrict men’s percentage of intercollegiate athletes to their percentage in overall student bodies, thus reducing the overall number of intercollegiate athletes. (Under the three-part Title IX test created by the Education Department’s Office for Civil Rights, where I used to work, colleges are allowed to temporarily comply by increasing the number of female athletes rather than cutting the number of male athletes, but the only viable permanent way to comply with its rule is to restrict men’s participation relative to women’s participation, reducing overall participation.) Thus, as Charlotte Allen notes, the Obama administration’s guidelines are likely to lead to “science quotas” based on gender.

Bader notes the hyprocrisy of gender-balancing quotas applying only in areas dominated by men:

Gender disparities in a major are not the product of sexism, but rather the differing preferences of men and women. The fact that engineering departments are filled mostly with men does not mean they discriminate against women anymore than the fact that English departments are filled mostly with women proves that English departments discriminate against men. The arts and humanities have well over 60 percent female students, yet no one seems to view that gender disparity as a sign of sexism against men. Deep down, the Obama administration knows this, since it is planning to impose its gender-proportionality rules only on the STEM fields (science, technology, engineering, and math), not other fields that have similarly large gender disparities in the opposite direction.

Read the whole thing for the gory details of the coming War on Men in science.