Gender is an amalgamation of nature and nurture Show more Show less
Both biological and societal factors contribute to the gender identity an individual associates themselves with.
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Gender roles are biologically evolutionary, capable of being socially constructed
Gender roles evolve with time. This is impacted biologically through evolution, as well as in tandem with society's structure.
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Biological evolution dictates that males and females have psychological differences due to the survival techniques that our ancestors had to use. Men are more aggressive and competitive as they have had to hunt and fight over females, and females are less promiscuous and more selective over males. These psychological differences explain the power imbalance of men and women where men are more dominant and females submissive. Even if there were biological and evolutionary predispositions of male and female characteristics, this does not mean that these must be followed as the natural course of things. Evolution is about survival, and not about what is right or wrong. As societal needs progress, the evolutionary needs of the past do not need to be the case. It can be altered through challenging the norms according to the needs of society and survival. 
The allotment of gender into just two categories of male of female is not accurate. There are many variations in gender which can be biological or behavioural. For example, those born with difference in genitalia, or with hormonal imbalances, such as of testosterone. Gender is therefore not binary as the biological evolution of gender theory suggests. Evidence of transgender individuals has existed in archaeological finds dating back to ancient civilisations. This suggests that gender is not binary, and that the approach that biological and psychological male and female characteristics developed as a result of their evolutionary survival needs does not reflect on the diversity within each of the male and female identities, and neither of those individuals that would have identified as transgender.
Rejecting the premises