XYY Syndrome

XYY syndrome is a chromosomal anomaly characterized by the presence of one X-chromosome and two Y-chromosomes. Some medical geneticists question whether the term “syndrome” is appropriate for this sex-linked trisomy, because afflicted males are physically normal—though they tend to be above average in height—and the vast majority of those affected do not know that they possess the extra chromosome. About 1 in 1,000 boys are born with this condition.

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