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XYY Syndrome
A rare syndrome affecting males. It is characterized by the presence of an extra Y chromosome. Individuals with this disorder are taller than other males of their age. Signs and symptoms include learning disabilities and difficulties with speech and language development. (NCI Thesaurus)
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The normal genotype of a male human.
A person who has a chromosome composition of 46 XY and who is phenotypically female.
A rare sex chromosome abnormality in which a male child has an extra X and Y chromosome.
