There are no simple answers to such questions. "Closed" questions to be answered just by a "yes" or a "no" seem uncommon within a scientic forum, to me.
My recommendation is: read Article A General Theory of Sexual Differentiation
dear sir/madam
In our country i.e. India sex determination and any discussion on this is only academic. For genuine reasons like detection of sex linked disorders , obviously ultrasound examination is the best bet for it
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for just determination of feral sex, I will go for ultrasound scan
@
Ultrasonography is the most sensitive non invasive way of determining foetal sex
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