[Quiet Man Cometh]

I think it's worth pointing out that there isn't, or doesn't appear to be, any straight definition of gender or sex that every discipline uses. Tiva, you are discussing the approach you take in Anthropology, but that doesn't mean that each other science or discipline will take it the same way, and that's part of existing debates on the nature of gender/sex/etc.

I imagine each discipline's approach to gender and sex is affected by how much it "cares" about it. I studied a fair amount of sociology in my first two years on college, among a general mixture of social sciences in all four years). In my classes, it was pointed out that gender and sex are two different things. Sex referred to an individual's biological assignment, which could be either male, female, or indeterminate. Gender referred to the habits that were categorized as either masculine or feminine, that were typically associated with each sex. Gender was viewed as largely social, while sex was biological. Since sociology cares a whole lot about perceptions of things in a society, that separation makes sense.

The same thing was done in my Women's Studies courses. Part of the issue with "gender inequality" was that the personal traits seen as masculine were considered more valuable than those perceived as feminine, and this was an excuse for the elevation of men because masculine traits are more predominant in males. This is not the only explanation for inequality of course, but it's one, and one I think we can still see in that it's largely acceptable for a woman to act in a masculine fashion, while it's not as acceptable for a man to act feminine (this is my personal observation here).

I admit, I find this thread a little confusing at times because, being accustomed to gender and sex being two different things, but knowing that people often use "gender" to refer to biological sex, I'm not always sure what exactly people are talking about.

I know that there are people who argue against defining sex by the presence of a Y chromosome and male parts, because they view that as a definition made by a society that focuses on men (such a person might point out the use of the word "Man" or "Mankind" to refer to humanity as another example). I'm not saying this to say that your definition is wrong, just that there is more than one approach to sex and gender, even in the academic world, and I think you'd be hard pressed to point at any particular approach and say 'this is how it works.'