Are gender roles validated by biology?

Certain ually dimorphic aspects of the brain and hormonal factors tend to be conducive towards certain behavioral traits. For example, higher levels of oxytocin in females provide women with a nurturing attitude necessary for rearing children, as the chemical is responsible for promoting social interaction. Likewise, testosterone in males gives rise to their inherently competitive nature, essential for attracting mates. This hormone has been scientifically noted to increase with level of achievement. In addition, certain brain structures, such as a present or absent INAH3, seem to precipitate activity (mounting) and pivity (lordosis) respectively. If uality is the central mechanism behind which we interact with each other, do men and women have an inherent propensity towards certain personality traits that comprise gender roles? Do men subconsciously strive to be better than their peers in sports, academics, jobs, etc. while women are relegated to positions such as housewives that utilize the behaviors ociated with child rearing and sociability? Are we slaves to our biology, or do we have free will over what we pursue in life? All opinions are welcome.