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[–] Gravspeed 0 points 2 points (+2|-0) ago 

Pretty much, higher testosterone.

My old bosses brother in law was xyy. 6'6", built like a refrigerator, 5 o'clock shadow by 10am. 6 boys.

[–] UncleDoug ago 

Jacob's syndrome is identified by hypotonia (muscle weakness and poor muscle tone). It's also not another gender, hermaphrodites are aberrative of either XX or XY chromosomal pairings. There is, and never has been a 3rd, 4th or more genders.