> I also wonder why Edith felt the need to mention gender not being binary in a discussion partly about whether biological sex influences choice of job, considering the fact that as far as I know biological sex is indeed binary, you either have at least one Y chromosome or you don't.
I think she refers that gender is not binary as you can be straight male, straight female, gay male, gay female, bisexual, asexual, etc.
I am not completely sure but I think there can be mutations where you have 2 chromosomes X and 1 Y. So XXY [1]
Sex, sexual orientation, and gender are different things. By gender spectrum she means that most people's behavior is somewhere along a continuum between completely masculine and completely feminine and that virtually nobody is at one extreme or the other.
I think the point she's making is that while men and women have different interests as groups, there are plenty of women who are interested in what are perceived as masculine things (in this case probably computer programming) and vice versa.
I think she refers that gender is not binary as you can be straight male, straight female, gay male, gay female, bisexual, asexual, etc.
I am not completely sure but I think there can be mutations where you have 2 chromosomes X and 1 Y. So XXY [1]
[1] https://en.wikipedia.org/wiki/Klinefelter_syndrome