Hijra are people who have a penis (not sure if sexually active) but look much like a female (perhaps for some feminine biological property). Wikipedia says they are "physiological males who have feminine gender identity"
Also, I just came to know there are some more types of third gender people.
Now, is there really any BIOLOGICAL third gender which cannot be categorized as male or female? Or its always possible to categorize them to male or female?
Answer
When dealing with humans, there are only two Biological genders as defined by the presence or absence of the Y-Chromosome. If the Y-Chromosome is not present, or through some process gets totally deactivated, the human will appear and function as a Female.
XX = Female
XY = Male
XXY = Male (Klinefelter's Syndrome)
XYY = Male (Aneuploidy - Normal Functioning Males)
XXX = Female (Aneuploidy - Normal Functioning Females)
X = Female (Turner's Syndrome - Generally infertile, other issues)
Y = Fatal (The Y-Chromosome is drastically smaller than the X-Chromosome, which contains many necessary genes)
XXYY = Male
...
The list goes on, since there have been records of up to XXXXX.
If there is a Y-Chromosome present, the human born will be male.
However, that is not to say that a person cannot psychologically identify as something else. It's also worth noting that the majority of known species are asexual and do not have genders, and that those which do have genders do not always follow the same rules (Fruit Flies, for instance, use the ratio of genes to determine sex).
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