Biology as a field ranges from majority female to 1:1 parity in the modern postgraduate cohorts I have seen; the physical and logical sciences at the postgraduate maintain large male imbalances and notably seem to do so across all western countries regardless of social ideology from the figures I have seen across various sources. It is true in my observation that gender-specific encouragements are consistently emphasized at the university level even oddly in scenarios where parity has been reached or exceeded.