If there were genetic differences between sexes or races, I'd be less likely to favor affirmative action at the college or employment level, because it wouldn't be effective. The injustice would be biological, not social, and it would be best fixed biologically.

With the caveat that a biological injustice and a social injustice are not mutually exclusive - there may be genetic differences between sexes/races, but that would not eliminate the possibility of additional unnecessary social barriers to college or work.

ETA: I should also have remembered that 'biological' does not equal 'genetic.'