A condition affecting males, caused by the presence of supernumerary Y chromosomes. This condition is asymptomatic. Confirmation is through observation of supernumerary Y chromosomes by karyotyping.
Also indexed as
Karyotype 47,XYYKaryotype 47,XYY, mosaicismKaryotype 47,XYY, regularMale with double or multiple YMale with more than two Y chromosomesdouble y syndromexyy syndrome