• 47,XYY syndrome is the presence of two Y chromosomes and one X chromosome in a phenotypic male.

    (See also Overview of Chromosomal Anomalies and see Overview of Sex Chromosome Anomalies.)

    The 47,XYY syndrome occurs in about 1/1000 live male births.

    Affected boys tend to be taller than average and have a 10- to 15-point IQ reduction compared with family members. There are few physical problems. Minor behavior disorders, hyperactivity, attention-deficit disorder, and learning disorders are more common.


    47,xyy syndrome meaning & definition 1 of 47,xyy syndrome.

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