DeletedUser
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It's highly unlikely that it would be in genetics, genetics has more of a determination of physical properties, however I guess like some genetic mutations it could alter how the brain develops/functions (I'm not saying it is a mutation or anything, I completely agree about the lack of equality). There have been some studies done that indicate that it may be a hormonal thing. I can't remember where I saw some of the more recent research, but I'm sure you could find them in time. This site has a pretty good summary of some past studies.
That website is offensive to my beliefs.