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XYY Syndrome 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 Approximate words: 417 Approximate pages: 2

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