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XYY Syndrome is a rare genetic disorder which affects males due to an extra Y chromosome. Healthy males have 46 chromosomes including one X and one Y chromosome. Men with XYY syndrome have 47 chromosomes, two of which are Y chromosomes. It is not known why the extra Y chromosome occurs. The disorder is present at birth and is estimated to occur in one out of every one thousand live births.
In very rare instances, the syndrome has been passed from father to son, but
in most cases heredity cannot be established.

The characteristics of XYY syndrome are often very subtle and do not indicate and serious chromosomal disorder. Therefore, males with this condition are frequently undiagnosed or misdiagnosed. The primary symptoms include tall or very tall height which becomes evident at the age of five or six, and severe cystic acne during adolescence.

Lower than average intelligence and/or behavioral problems, such as an explosive
temper, aggressive or defiant actions, or......

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Approximate Word Count: 391
Approximate Pages: 2 (250 words per double-spaced page)

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