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How much of gender roles are based on nature vs. nurture?
I, and the psych community, do not know. The problem with this question is that no controlled experiment can be done to figure it out, other than messing with lab animals. Various cultures can be studied to determine what is and is not an inherent gender trait. We can also turn to biology and determine hormonal and other body differences.
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Does the previous question matter in the struggle for gender equality?
No, because the struggle involves legal issues, not psychological or physiological. The struggle takes into account the prejudices of society when making law. For example, do women make as much money as men? If not, are women to be given different treatment under divorce laws? Or do we approach each case individually? Should women be given the right to vote? The right to choice in abortion issues? Should only men be put into combat zones? Do men have any rights to leadership in personal relationships?
Law, by necessity, has to generalize. In the not too distant past, the generalizations worked against women (right to vote, rights in marriage, rights in general). Today, the generalizations being proposed for various issues also involve the denial of rights based on gender, and what looks to me as a strongly related thing, sexual orientation.
I've studied enough psychology and biology to know that any generalization has exceptions, and often the exceptions involve significant populations. Sometimes the generalizations are just plain wrong, based on social prejudice.
That's the tricky part with gender equality -- what laws are based on social prejudice? What laws are based on true difference? That laws should not be based on social prejudice is another issue. Some folks seem to think this is an okay way to run a country, turning back the clock hundreds if not thousands of years.
You know, the case mentioned here involves a sanctioned genital mutilation gone wrong. Still, biologically speaking, the differentiation of gender during development in the womb is sometimes not clear at birth. You end up with both sexes in one body. Does this happen often? Good question. From the literature I've seen, not often. But then I think, how many times does a doctor make a command decision and not document it?
As for boy and girl treatment, sure, lots of differences there. Lots of cross-over too. Should adolescent girls play football? Should adolescent boys take home ec?
Some of this has legal implications, some does not. Some is based on hormonal differences and some simply on interest. For example, it was considered less than manly to take a couple years of typing when I was in high school in the 1960s. Only secretaries needed that, and only women became secretaries. As it turned out, this training came in very handy in the computer and writing businesses.
Psychic impression? Inherent interest? Eh, doesn't matter. But why was it not manly? Only from social prejudice, and that prejudice turned out to be very wrong.
Good thing I don't think very highly of social prejudices.